diff --git a/vm.c b/vm.c
index 730e88d06d..bc8a1681f4 100644
--- a/vm.c
+++ b/vm.c
@@ -3583,7 +3583,7 @@ thread_alloc(VALUE klass)
     return TypedData_Make_Struct(klass, rb_thread_t, &thread_data_type, th);
 }
 
-inline void
+void
 rb_ec_set_vm_stack(rb_execution_context_t *ec, VALUE *stack, size_t size)
 {
     ec->vm_stack = stack;