diff --git a/ext/liquid_c/vm.c b/ext/liquid_c/vm.c
index f24a2334..7755c1ee 100644
--- a/ext/liquid_c/vm.c
+++ b/ext/liquid_c/vm.c
@@ -235,15 +235,11 @@ static VALUE vm_render_until_error(VALUE uncast_args)
     const uint8_t *ip = args->ip;
     vm_t *vm = args->vm;
     VALUE output = args->output;
+    uint16_t constant_index;
     VALUE constant = Qnil;
     args->ip = NULL; // used by vm_render_rescue, NULL to indicate that it isn't in a rescue block
 
     while (true) {
-        if (vm_assembler_opcode_has_constant(*ip)) {
-            uint16_t constant_index = (ip[1] << 8) | ip[2];
-            constant = constants[constant_index];
-        }
-
         switch (*ip++) {
             case OP_LEAVE:
                 return false;
@@ -271,6 +267,8 @@ static VALUE vm_render_until_error(VALUE uncast_args)
             }
             case OP_FIND_STATIC_VAR:
             {
+                constant_index = (ip[0] << 8) | ip[1];
+                constant = constants[constant_index];
                 ip += 2;
                 VALUE value = context_find_variable(&vm->context, constant, Qtrue);
                 vm_stack_push(vm, value);
@@ -286,6 +284,8 @@ static VALUE vm_render_until_error(VALUE uncast_args)
             case OP_LOOKUP_CONST_KEY:
             case OP_LOOKUP_COMMAND:
             {
+                constant_index = (ip[0] << 8) | ip[1];
+                constant = constants[constant_index];
                 ip += 2;
                 vm_stack_push(vm, constant);
             }
@@ -325,6 +325,8 @@ static VALUE vm_render_until_error(VALUE uncast_args)
                 uint8_t num_args;
 
                 if (ip[-1] == OP_FILTER) {
+                    constant_index = (ip[0] << 8) | ip[1];
+                    constant = constants[constant_index];
                     filter_name = RARRAY_AREF(constant, 0);
                     num_args = RARRAY_AREF(constant, 1);
                     ip += 2;
@@ -376,6 +378,8 @@ static VALUE vm_render_until_error(VALUE uncast_args)
 
             case OP_PUSH_CONST:
             {
+                constant_index = (ip[0] << 8) | ip[1];
+                constant = constants[constant_index];
                 ip += 2;
                 vm_stack_push(vm, constant);
                 break;
@@ -383,6 +387,8 @@ static VALUE vm_render_until_error(VALUE uncast_args)
 
             case OP_WRITE_NODE:
             {
+                constant_index = (ip[0] << 8) | ip[1];
+                constant = constants[constant_index];
                 ip += 2;
                 rb_funcall(cLiquidBlockBody, id_render_node, 3, vm->context.self, output, constant);