diff --git a/noir-projects/aztec-nr/aztec/src/context/call_interfaces.nr b/noir-projects/aztec-nr/aztec/src/context/call_interfaces.nr
index a540488b158..49d5a424ac0 100644
--- a/noir-projects/aztec-nr/aztec/src/context/call_interfaces.nr
+++ b/noir-projects/aztec-nr/aztec/src/context/call_interfaces.nr
@@ -53,7 +53,10 @@ pub struct PrivateCallInterface<let N: u32, T, Env> {
 
 impl<let N: u32, T, Env> PrivateCallInterface<N, T, Env> {
     pub fn call<let M: u32>(self, context: &mut PrivateContext) -> T where T: Deserialize<M> {
-        assert(self.args_hash == pack_arguments(self.args));
+        let packed_args_hash = unsafe {
+            pack_arguments(self.args)
+        };
+        assert(self.args_hash == packed_args_hash);
         let returns = context.call_private_function_with_packed_args(
             self.target_contract,
             self.selector,
@@ -66,13 +69,19 @@ impl<let N: u32, T, Env> PrivateCallInterface<N, T, Env> {
     }
 
     pub fn view<let M: u32>(self, context: &mut PrivateContext) -> T where T: Deserialize<M> {
-        assert(self.args_hash == pack_arguments(self.args));
+        let packed_args_hash = unsafe {
+            pack_arguments(self.args)
+        };
+        assert(self.args_hash == packed_args_hash);
         let returns = context.call_private_function_with_packed_args(self.target_contract, self.selector, self.args_hash, true, false);
         returns.unpack_into()
     }
 
     pub fn delegate_call<let M: u32>(self, context: &mut PrivateContext) -> T where T: Deserialize<M> {
-        assert(self.args_hash == pack_arguments(self.args));
+        let packed_args_hash = unsafe {
+            pack_arguments(self.args)
+        };
+        assert(self.args_hash == packed_args_hash);
         let returns = context.call_private_function_with_packed_args(self.target_contract, self.selector, self.args_hash, false, true);
         returns.unpack_into()
     }
@@ -96,7 +105,10 @@ pub struct PrivateVoidCallInterface<let N: u32, Env> {
 
 impl<let N: u32, Env> PrivateVoidCallInterface<N, Env> {
     pub fn call(self, context: &mut PrivateContext) {
-        assert(self.args_hash == pack_arguments(self.args));
+        let packed_args_hash = unsafe {
+            pack_arguments(self.args)
+        };
+        assert(self.args_hash == packed_args_hash);
         context.call_private_function_with_packed_args(
             self.target_contract,
             self.selector,
@@ -107,12 +119,18 @@ impl<let N: u32, Env> PrivateVoidCallInterface<N, Env> {
     }
 
     pub fn view(self, context: &mut PrivateContext) {
-        assert(self.args_hash == pack_arguments(self.args));
+        let packed_args_hash = unsafe {
+            pack_arguments(self.args)
+        };
+        assert(self.args_hash == packed_args_hash);
         context.call_private_function_with_packed_args(self.target_contract, self.selector, self.args_hash, true, false).assert_empty();
     }
 
     pub fn delegate_call(self, context: &mut PrivateContext) {
-        assert(self.args_hash == pack_arguments(self.args));
+        let packed_args_hash = unsafe {
+            pack_arguments(self.args)
+        };
+        assert(self.args_hash == packed_args_hash);
         context.call_private_function_with_packed_args(self.target_contract, self.selector, self.args_hash, false, true).assert_empty();
     }
 }
@@ -135,7 +153,10 @@ pub struct PrivateStaticCallInterface<let N: u32, T, Env> {
 
 impl<let N: u32, T, Env> PrivateStaticCallInterface<N, T, Env> {
     pub fn view<let M: u32>(self, context: &mut PrivateContext) -> T where T: Deserialize<M> {
-        assert(self.args_hash == pack_arguments(self.args));
+        let packed_args_hash = unsafe {
+            pack_arguments(self.args)
+        };
+        assert(self.args_hash == packed_args_hash);
         let returns = context.call_private_function_with_packed_args(self.target_contract, self.selector, self.args_hash, true, false);
         returns.unpack_into()
     }
@@ -159,7 +180,10 @@ pub struct PrivateStaticVoidCallInterface<let N: u32, Env> {
 
 impl<let N: u32, Env> PrivateStaticVoidCallInterface<N, Env> {
     pub fn view(self, context: &mut PrivateContext) {
-        assert(self.args_hash == pack_arguments(self.args));
+        let packed_args_hash = unsafe {
+            pack_arguments(self.args)
+        };
+        assert(self.args_hash == packed_args_hash);
         context.call_private_function_with_packed_args(self.target_contract, self.selector, self.args_hash, true, false).assert_empty();
     }
 }
@@ -203,7 +227,10 @@ impl<let N: u32, T, Env> PublicCallInterface<N, T, Env> {
 
     pub fn enqueue(self, context: &mut PrivateContext) {
         let args_hash = hash_args(self.args);
-        assert(args_hash == pack_arguments(self.args));
+        let packed_args_hash = unsafe {
+            pack_arguments(self.args)
+        };
+        assert(args_hash == packed_args_hash);
         context.call_public_function_with_packed_args(
             self.target_contract,
             self.selector,
@@ -215,7 +242,10 @@ impl<let N: u32, T, Env> PublicCallInterface<N, T, Env> {
 
     pub fn enqueue_view(self, context: &mut PrivateContext) {
         let args_hash = hash_args(self.args);
-        assert(args_hash == pack_arguments(self.args));
+        let packed_args_hash = unsafe {
+            pack_arguments(self.args)
+        };
+        assert(args_hash == packed_args_hash);
         context.call_public_function_with_packed_args(
             self.target_contract,
             self.selector,
@@ -227,7 +257,10 @@ impl<let N: u32, T, Env> PublicCallInterface<N, T, Env> {
 
     pub fn delegate_enqueue(self, context: &mut PrivateContext) {
         let args_hash = hash_args(self.args);
-        assert(args_hash == pack_arguments(self.args));
+        let packed_args_hash = unsafe {
+            pack_arguments(self.args)
+        };
+        assert(args_hash == packed_args_hash);
         context.call_public_function_with_packed_args(
             self.target_contract,
             self.selector,
@@ -277,7 +310,10 @@ impl<let N: u32, Env> PublicVoidCallInterface<N, Env> {
 
     pub fn enqueue(self, context: &mut PrivateContext) {
         let args_hash = hash_args(self.args);
-        assert(args_hash == pack_arguments(self.args));
+        let packed_args_hash = unsafe {
+            pack_arguments(self.args)
+        };
+        assert(args_hash == packed_args_hash);
         context.call_public_function_with_packed_args(
             self.target_contract,
             self.selector,
@@ -289,7 +325,10 @@ impl<let N: u32, Env> PublicVoidCallInterface<N, Env> {
 
     pub fn enqueue_view(self, context: &mut PrivateContext) {
         let args_hash = hash_args(self.args);
-        assert(args_hash == pack_arguments(self.args));
+        let packed_args_hash = unsafe {
+            pack_arguments(self.args)
+        };
+        assert(args_hash == packed_args_hash);
         context.call_public_function_with_packed_args(
             self.target_contract,
             self.selector,
@@ -301,7 +340,10 @@ impl<let N: u32, Env> PublicVoidCallInterface<N, Env> {
 
     pub fn delegate_enqueue(self, context: &mut PrivateContext) {
         let args_hash = hash_args(self.args);
-        assert(args_hash == pack_arguments(self.args));
+        let packed_args_hash = unsafe {
+            pack_arguments(self.args)
+        };
+        assert(args_hash == packed_args_hash);
         context.call_public_function_with_packed_args(
             self.target_contract,
             self.selector,
@@ -342,7 +384,10 @@ impl<let N: u32, T, Env> PublicStaticCallInterface<N, T, Env> {
 
     pub fn enqueue_view(self, context: &mut PrivateContext) {
         let args_hash = hash_args(self.args);
-        assert(args_hash == pack_arguments(self.args));
+        let packed_args_hash = unsafe {
+            pack_arguments(self.args)
+        };
+        assert(args_hash == packed_args_hash);
         context.call_public_function_with_packed_args(
             self.target_contract,
             self.selector,
@@ -382,7 +427,10 @@ impl<let N: u32, Env> PublicStaticVoidCallInterface<N, Env> {
 
     pub fn enqueue_view(self, context: &mut PrivateContext) {
         let args_hash = hash_args(self.args);
-        assert(args_hash == pack_arguments(self.args));
+        let packed_args_hash = unsafe {
+            pack_arguments(self.args)
+        };
+        assert(args_hash == packed_args_hash);
         context.call_public_function_with_packed_args(
             self.target_contract,
             self.selector,
diff --git a/noir-projects/aztec-nr/aztec/src/context/public_context.nr b/noir-projects/aztec-nr/aztec/src/context/public_context.nr
index fa32f86967f..0a3da729960 100644
--- a/noir-projects/aztec-nr/aztec/src/context/public_context.nr
+++ b/noir-projects/aztec-nr/aztec/src/context/public_context.nr
@@ -288,7 +288,7 @@ unconstrained fn call_static<let RET_SIZE: u32>(
     call_static_opcode(gas, address, args, function_selector)
 }
 
-unconstrained fn calldata_copy<let N: u32>(cdoffset: u32, copy_size: u32) -> [Field; N] {
+unconstrained pub fn calldata_copy<let N: u32>(cdoffset: u32, copy_size: u32) -> [Field; N] {
     calldata_copy_opcode(cdoffset, copy_size)
 }
 
diff --git a/noir-projects/aztec-nr/aztec/src/macros/functions/interfaces.nr b/noir-projects/aztec-nr/aztec/src/macros/functions/interfaces.nr
index ecd4fe1fe41..25486c1d07a 100644
--- a/noir-projects/aztec-nr/aztec/src/macros/functions/interfaces.nr
+++ b/noir-projects/aztec-nr/aztec/src/macros/functions/interfaces.nr
@@ -146,9 +146,17 @@ pub comptime fn stub_fn(f: FunctionDefinition) -> Quoted {
     } else {
         parameter_names_list.join(quote {,})
     };
-    let original = quote {
-        | inputs: $input_type  | -> $return_type_hint {
-            $fn_name($parameter_names)
+    let original = if is_fn_private(f) {
+        quote {
+            | inputs: $input_type  | -> $return_type_hint {
+                $fn_name($parameter_names)
+            }
+        }
+    } else {
+        quote {
+            | _: $input_type | -> $return_type_hint {
+                unsafe { $fn_name($parameter_names) }
+            }
         }
     };