diff --git a/vm.c b/vm.c
index cc010029ba..c67ace1fdd 100644
--- a/vm.c
+++ b/vm.c
@@ -12,10 +12,7 @@
 #include "ruby/vm.h"
 #include "ruby/st.h"
 
-#define vm_call0 rb_vm_call0
 #define vm_exec rb_vm_exec
-#define vm_invoke_bmethod rb_vm_invoke_bmethod
-#define vm_search_method_slowpath rb_vm_search_method_slowpath
 
 #include "gc.h"
 #include "vm_core.h"
@@ -302,7 +299,7 @@ static void vm_collect_usage_register(int reg, int isset);
 #endif
 
 static VALUE vm_make_env_object(const rb_execution_context_t *ec, rb_control_frame_t *cfp);
-extern VALUE vm_invoke_bmethod(rb_execution_context_t *ec, rb_proc_t *proc, VALUE self, int argc, const VALUE *argv, VALUE block_handler);
+extern VALUE rb_vm_invoke_bmethod(rb_execution_context_t *ec, rb_proc_t *proc, VALUE self, int argc, const VALUE *argv, VALUE block_handler);
 static VALUE vm_invoke_proc(rb_execution_context_t *ec, rb_proc_t *proc, VALUE self, int argc, const VALUE *argv, VALUE block_handler);
 
 static VALUE rb_block_param_proxy;
@@ -1173,7 +1170,7 @@ vm_invoke_proc(rb_execution_context_t *ec, rb_proc_t *proc, VALUE self,
 }
 
 MJIT_FUNC_EXPORTED VALUE
-vm_invoke_bmethod(rb_execution_context_t *ec, rb_proc_t *proc, VALUE self,
+rb_vm_invoke_bmethod(rb_execution_context_t *ec, rb_proc_t *proc, VALUE self,
 		  int argc, const VALUE *argv, VALUE block_handler)
 {
     return invoke_block_from_c_proc(ec, proc, self, argc, argv, block_handler, TRUE);
@@ -1187,7 +1184,7 @@ rb_vm_invoke_proc(rb_execution_context_t *ec, rb_proc_t *proc,
     vm_block_handler_verify(passed_block_handler);
 
     if (proc->is_from_method) {
-	return vm_invoke_bmethod(ec, proc, self, argc, argv, passed_block_handler);
+        return rb_vm_invoke_bmethod(ec, proc, self, argc, argv, passed_block_handler);
     }
     else {
 	return vm_invoke_proc(ec, proc, self, argc, argv, passed_block_handler);
diff --git a/vm_args.c b/vm_args.c
index 3c1a2a3d75..0c7db1cb9d 100644
--- a/vm_args.c
+++ b/vm_args.c
@@ -810,7 +810,7 @@ vm_to_proc(VALUE proc)
 	    rb_callable_method_entry_with_refinements(CLASS_OF(proc), idTo_proc, NULL);
 
 	if (me) {
-	    b = vm_call0(GET_EC(), proc, idTo_proc, 0, NULL, me);
+            b = rb_vm_call0(GET_EC(), proc, idTo_proc, 0, NULL, me);
 	}
 	else {
 	    /* NOTE: calling method_missing */
@@ -850,7 +850,7 @@ refine_sym_proc_call(RB_BLOCK_CALL_FUNC_ARGLIST(yielded_arg, callback_arg))
     if (!me) {
 	return method_missing(obj, mid, argc, argv, MISSING_NOENTRY);
     }
-    return vm_call0(ec, obj, mid, argc, argv, me);
+    return rb_vm_call0(ec, obj, mid, argc, argv, me);
 }
 
 static void
diff --git a/vm_eval.c b/vm_eval.c
index c726c61f0b..fcc87cb6d1 100644
--- a/vm_eval.c
+++ b/vm_eval.c
@@ -41,7 +41,7 @@ static VALUE vm_call0_body(rb_execution_context_t* ec, struct rb_calling_info *c
 #ifndef MJIT_HEADER
 
 MJIT_FUNC_EXPORTED VALUE
-vm_call0(rb_execution_context_t *ec, VALUE recv, ID id, int argc, const VALUE *argv, const rb_callable_method_entry_t *me)
+rb_vm_call0(rb_execution_context_t *ec, VALUE recv, ID id, int argc, const VALUE *argv, const rb_callable_method_entry_t *me)
 {
     struct rb_calling_info calling_entry, *calling;
     struct rb_call_info ci_entry;
@@ -206,7 +206,7 @@ vm_call0_body(rb_execution_context_t *ec, struct rb_calling_info *calling, const
 VALUE
 rb_vm_call(rb_execution_context_t *ec, VALUE recv, VALUE id, int argc, const VALUE *argv, const rb_callable_method_entry_t *me)
 {
-    return vm_call0(ec, recv, id, argc, argv, me);
+    return rb_vm_call0(ec, recv, id, argc, argv, me);
 }
 
 static inline VALUE
@@ -231,7 +231,7 @@ vm_call_super(rb_execution_context_t *ec, int argc, const VALUE *argv)
 	return method_missing(recv, id, argc, argv, MISSING_SUPER);
     }
     else {
-	return vm_call0(ec, recv, id, argc, argv, me);
+        return rb_vm_call0(ec, recv, id, argc, argv, me);
     }
 }
 
@@ -299,7 +299,7 @@ rb_call0(rb_execution_context_t *ec,
 	return method_missing(recv, mid, argc, argv, call_status);
     }
     stack_check(ec);
-    return vm_call0(ec, recv, mid, argc, argv, me);
+    return rb_vm_call0(ec, recv, mid, argc, argv, me);
 }
 
 struct rescue_funcall_args {
@@ -417,7 +417,7 @@ rb_check_funcall_default(VALUE recv, ID mid, int argc, const VALUE *argv, VALUE
 	return ret;
     }
     stack_check(ec);
-    return vm_call0(ec, recv, mid, argc, argv, me);
+    return rb_vm_call0(ec, recv, mid, argc, argv, me);
 }
 
 VALUE
@@ -443,7 +443,7 @@ rb_check_funcall_with_hook(VALUE recv, ID mid, int argc, const VALUE *argv,
     }
     stack_check(ec);
     (*hook)(TRUE, recv, mid, argc, argv, arg);
-    return vm_call0(ec, recv, mid, argc, argv, me);
+    return rb_vm_call0(ec, recv, mid, argc, argv, me);
 }
 
 const char *
@@ -735,7 +735,7 @@ method_missing(VALUE obj, ID id, int argc, const VALUE *argv, enum method_missin
     me = rb_callable_method_entry(klass, idMethodMissing);
     if (!me || METHOD_ENTRY_BASIC(me)) goto missing;
     vm_passed_block_handler_set(ec, block_handler);
-    result = vm_call0(ec, obj, idMethodMissing, argc, argv, me);
+    result = rb_vm_call0(ec, obj, idMethodMissing, argc, argv, me);
     if (work) ALLOCV_END(work);
     return result;
 }
diff --git a/vm_insnhelper.c b/vm_insnhelper.c
index 3fac8eb1fa..b8a5112de7 100644
--- a/vm_insnhelper.c
+++ b/vm_insnhelper.c
@@ -1302,7 +1302,7 @@ vm_expandarray(VALUE *sp, VALUE ary, rb_num_t num, int flag)
 static VALUE vm_call_general(rb_execution_context_t *ec, rb_control_frame_t *reg_cfp, struct rb_calling_info *calling, const struct rb_call_info *ci, struct rb_call_cache *cc);
 
 MJIT_FUNC_EXPORTED void
-vm_search_method_slowpath(const struct rb_call_info *ci, struct rb_call_cache *cc, VALUE klass)
+rb_vm_search_method_slowpath(const struct rb_call_info *ci, struct rb_call_cache *cc, VALUE klass)
 {
     cc->me = rb_callable_method_entry(klass, ci->mid);
     VM_ASSERT(callable_method_entry_p(cc->me));
@@ -1333,7 +1333,7 @@ vm_search_method(const struct rb_call_info *ci, struct rb_call_cache *cc, VALUE
     }
     RB_DEBUG_COUNTER_INC(mc_inline_miss);
 #endif
-    vm_search_method_slowpath(ci, cc, klass);
+    rb_vm_search_method_slowpath(ci, cc, klass);
 }
 
 static inline int
@@ -1473,7 +1473,7 @@ rb_eql_opt(VALUE obj1, VALUE obj2)
     return opt_eql_func(obj1, obj2, &ci, &cc);
 }
 
-extern VALUE vm_call0(rb_execution_context_t *ec, VALUE, ID, int, const VALUE*, const rb_callable_method_entry_t *);
+extern VALUE rb_vm_call0(rb_execution_context_t *ec, VALUE, ID, int, const VALUE*, const rb_callable_method_entry_t *);
 
 static VALUE
 check_match(rb_execution_context_t *ec, VALUE pattern, VALUE target, enum vm_check_match_type type)
@@ -1490,7 +1490,7 @@ check_match(rb_execution_context_t *ec, VALUE pattern, VALUE target, enum vm_che
 	const rb_callable_method_entry_t *me =
 	    rb_callable_method_entry_with_refinements(CLASS_OF(pattern), idEqq, NULL);
 	if (me) {
-	    return vm_call0(ec, pattern, idEqq, 1, &target, me);
+            return rb_vm_call0(ec, pattern, idEqq, 1, &target, me);
 	}
 	else {
 	    /* fallback to funcall (e.g. method_missing) */
@@ -1972,7 +1972,7 @@ vm_call_bmethod_body(rb_execution_context_t *ec, struct rb_calling_info *calling
     /* control block frame */
     ec->passed_bmethod_me = cc->me;
     GetProcPtr(cc->me->def->body.proc, proc);
-    val = vm_invoke_bmethod(ec, proc, calling->recv, calling->argc, argv, calling->block_handler);
+    val = rb_vm_invoke_bmethod(ec, proc, calling->recv, calling->argc, argv, calling->block_handler);
 
     return val;
 }
diff --git a/vm_method.c b/vm_method.c
index 6a829ca23f..520d41f36b 100644
--- a/vm_method.c
+++ b/vm_method.c
@@ -1913,7 +1913,7 @@ call_method_entry(rb_execution_context_t *ec, VALUE defined_class, VALUE obj, ID
     const rb_callable_method_entry_t *cme =
 	prepare_callable_method_entry(defined_class, id, me);
     VALUE passed_block_handler = vm_passed_block_handler(ec);
-    VALUE result = vm_call0(ec, obj, id, argc, argv, cme);
+    VALUE result = rb_vm_call0(ec, obj, id, argc, argv, cme);
     vm_passed_block_handler_set(ec, passed_block_handler);
     return result;
 }