diff --git a/cont.c b/cont.c
index 75b259a3c2..c0be42bffc 100644
--- a/cont.c
+++ b/cont.c
@@ -1713,18 +1713,6 @@ fiber_t_alloc(VALUE fiber_value)
     return fiber;
 }
 
-rb_control_frame_t *
-rb_vm_push_frame(rb_execution_context_t *sec,
-                 const rb_iseq_t *iseq,
-                 VALUE type,
-                 VALUE self,
-                 VALUE specval,
-                 VALUE cref_or_me,
-                 const VALUE *pc,
-                 VALUE *sp,
-                 int local_size,
-                 int stack_max);
-
 static VALUE
 fiber_initialize(VALUE self, VALUE proc, struct fiber_pool * fiber_pool)
 {
diff --git a/thread.c b/thread.c
index 2b785a7ebe..f9fc70f3cf 100644
--- a/thread.c
+++ b/thread.c
@@ -691,17 +691,6 @@ thread_do_start(rb_thread_t *th)
 }
 
 void rb_ec_clear_current_thread_trace_func(const rb_execution_context_t *ec);
-rb_control_frame_t *
-rb_vm_push_frame(rb_execution_context_t *sec,
-                 const rb_iseq_t *iseq,
-                 VALUE type,
-                 VALUE self,
-                 VALUE specval,
-                 VALUE cref_or_me,
-                 const VALUE *pc,
-                 VALUE *sp,
-                 int local_size,
-                 int stack_max);
 
 static int
 thread_start_func_2(rb_thread_t *th, VALUE *stack_start)
diff --git a/vm.c b/vm.c
index f678a16ba5..13b302a27b 100644
--- a/vm.c
+++ b/vm.c
@@ -2662,7 +2662,7 @@ rb_ec_initialize_vm_stack(rb_execution_context_t *ec, VALUE *stack, size_t size)
 
     ec->cfp = (void *)(ec->vm_stack + ec->vm_stack_size);
 
-    rb_vm_push_frame(ec,
+    vm_push_frame(ec,
         NULL /* dummy iseq */,
         VM_FRAME_MAGIC_DUMMY | VM_ENV_FLAG_LOCAL | VM_FRAME_FLAG_FINISH | VM_FRAME_FLAG_CFRAME /* dummy frame */,
         Qnil /* dummy self */, VM_BLOCK_HANDLER_NONE /* dummy block ptr */,
diff --git a/vm_insnhelper.c b/vm_insnhelper.c
index c5584d4d40..57f6d91e88 100644
--- a/vm_insnhelper.c
+++ b/vm_insnhelper.c
@@ -345,21 +345,6 @@ vm_push_frame(rb_execution_context_t *ec,
     return cfp;
 }
 
-rb_control_frame_t *
-rb_vm_push_frame(rb_execution_context_t *ec,
-		 const rb_iseq_t *iseq,
-		 VALUE type,
-		 VALUE self,
-		 VALUE specval,
-		 VALUE cref_or_me,
-		 const VALUE *pc,
-		 VALUE *sp,
-		 int local_size,
-		 int stack_max)
-{
-    return vm_push_frame(ec, iseq, type, self, specval, cref_or_me, pc, sp, local_size, stack_max);
-}
-
 /* return TRUE if the frame is finished */
 static inline int
 vm_pop_frame(rb_execution_context_t *ec, rb_control_frame_t *cfp, const VALUE *ep)