diff --git a/vm_insnhelper.c b/vm_insnhelper.c
index 7ee39c736b..7169a0f7c1 100644
--- a/vm_insnhelper.c
+++ b/vm_insnhelper.c
@@ -861,7 +861,8 @@ vm_search_const_defined_class(const VALUE cbase, ID id)
 #define USE_IC_FOR_IVAR 1
 #endif
 
-ALWAYS_INLINE() inline VALUE
+ALWAYS_INLINE(static VALUE vm_getivar(VALUE, ID, IC, struct rb_call_cache *, int));
+static inline VALUE
 vm_getivar(VALUE obj, ID id, IC ic, struct rb_call_cache *cc, int is_attr)
 {
 #if USE_IC_FOR_IVAR