1 files changed, 8 insertions, 2 deletions

diff --git a/parse.y b/parse.y
index 30ea0c8133..7820b0b4ac 100644
--- a/parse.y
+++ b/parse.y
@@ -10774,9 +10774,12 @@ rb_sym2id(VALUE x)
     if (STATIC_SYM_P(x)) {
 	return RSHIFT((unsigned long)(x),RUBY_SPECIAL_SHIFT);
     }
-    else {
+    else if (!SPECIAL_CONST_P(x) && BUILTIN_TYPE(x) == T_SYMBOL) {
 	return rb_pin_dynamic_symbol(x);
     }
+    else {
+	return 0;
+    }
 }
 
 ID
@@ -10785,9 +10788,12 @@ rb_sym2id_without_pindown(VALUE x)
     if (STATIC_SYM_P(x)) {
 	return RSHIFT((unsigned long)(x),RUBY_SPECIAL_SHIFT);
     }
-    else {
+    else if (!SPECIAL_CONST_P(x) && BUILTIN_TYPE(x) == T_SYMBOL) {
 	return (ID)x;
     }
+    else {
+	return 0;
+    }
 }
 
 VALUE