1 files changed, 1 insertions, 1 deletions
diff --git a/parse.y b/parse.y
index 4005e7265f..ceaeed29a4 100644
--- a/parse.y
+++ b/parse.y
@@ -9498,7 +9498,7 @@ rb_intern3(const char *name, long len, rb_encoding *enc)
       mbstr:;
     }
   new_id:
-    if (!(global_symbols.last_id << (ID_SCOPE_SHIFT+RUBY_SPECIAL_SHIFT))) {
+    if (global_symbols.last_id >= ~(ID)0 >> (ID_SCOPE_SHIFT+RUBY_SPECIAL_SHIFT)) {
 	if (len > 20) {
 	    rb_raise(rb_eRuntimeError, "symbol table overflow (symbol %.20s...)",
 		     name);