diff --git a/library/core/src/ptr/mod.rs b/library/core/src/ptr/mod.rs
index ba8b0670147ae..0eb10a0967d3f 100644
--- a/library/core/src/ptr/mod.rs
+++ b/library/core/src/ptr/mod.rs
@@ -1851,16 +1851,20 @@ macro_rules! fnptr_impls_args {
         fnptr_impls_safety_abi! { extern "Rust" fn($($Arg),+) -> Ret, $($Arg),+ }
         fnptr_impls_safety_abi! { extern "C" fn($($Arg),+) -> Ret, $($Arg),+ }
         fnptr_impls_safety_abi! { extern "C" fn($($Arg),+ , ...) -> Ret, $($Arg),+ }
+        fnptr_impls_safety_abi! { extern "system" fn($($Arg),+) -> Ret, $($Arg),+ }
         fnptr_impls_safety_abi! { unsafe extern "Rust" fn($($Arg),+) -> Ret, $($Arg),+ }
         fnptr_impls_safety_abi! { unsafe extern "C" fn($($Arg),+) -> Ret, $($Arg),+ }
         fnptr_impls_safety_abi! { unsafe extern "C" fn($($Arg),+ , ...) -> Ret, $($Arg),+ }
+        fnptr_impls_safety_abi! { unsafe extern "system" fn($($Arg),+) -> Ret, $($Arg),+ }
     };
     () => {
         // No variadic functions with 0 parameters
         fnptr_impls_safety_abi! { extern "Rust" fn() -> Ret, }
         fnptr_impls_safety_abi! { extern "C" fn() -> Ret, }
+        fnptr_impls_safety_abi! { extern "system" fn() -> Ret, }
         fnptr_impls_safety_abi! { unsafe extern "Rust" fn() -> Ret, }
         fnptr_impls_safety_abi! { unsafe extern "C" fn() -> Ret, }
+        fnptr_impls_safety_abi! { unsafe extern "system" fn() -> Ret, }
     };
 }
 
diff --git a/src/test/ui/binop/issue-77910-1.stderr b/src/test/ui/binop/issue-77910-1.stderr
index 95ee51a88261a..c6b892a509680 100644
--- a/src/test/ui/binop/issue-77910-1.stderr
+++ b/src/test/ui/binop/issue-77910-1.stderr
@@ -25,7 +25,7 @@ LL |     assert_eq!(foo, y);
              extern "C" fn(A, B, C) -> Ret
              extern "C" fn(A, B, C, ...) -> Ret
              extern "C" fn(A, B, C, D) -> Ret
-           and 68 others
+           and 94 others
    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: aborting due to 2 previous errors
diff --git a/src/test/ui/issues/issue-59488.stderr b/src/test/ui/issues/issue-59488.stderr
index 76a47c49bbafb..49c5527fa06bc 100644
--- a/src/test/ui/issues/issue-59488.stderr
+++ b/src/test/ui/issues/issue-59488.stderr
@@ -103,7 +103,7 @@ LL |     assert_eq!(Foo::Bar, i);
              extern "C" fn(A, B, C) -> Ret
              extern "C" fn(A, B, C, ...) -> Ret
              extern "C" fn(A, B, C, D) -> Ret
-           and 68 others
+           and 94 others
    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: aborting due to 9 previous errors