diff --git a/variable.c b/variable.c
index ee298a0311..82dd217968 100644
--- a/variable.c
+++ b/variable.c
@@ -2140,7 +2140,7 @@ void
 rb_const_set(VALUE klass, ID id, VALUE val)
 {
     rb_const_entry_t *ce;
-    rb_const_flag_t visibility = CONST_PUBLIC
+    rb_const_flag_t visibility = CONST_PUBLIC;
 
     if (NIL_P(klass)) {
 	rb_raise(rb_eTypeError, "no class/module to define constant %"PRIsVALUE"",