1 files changed, 1 insertions, 1 deletions
diff --git a/ruby.h b/ruby.h
index c6cf32186d..df0ae75e9f 100644
--- a/ruby.h
+++ b/ruby.h
@@ -195,7 +195,7 @@ VALUE rb_ull2inum(unsigned LONG_LONG);
 #define IMMEDIATE_MASK 0x03
 #define IMMEDIATE_P(x) ((VALUE)(x) & IMMEDIATE_MASK)
 
-#define SYMBOL_P(x) (!IMMEDIATE_P(x) && RBASIC(x)->klass == rb_cSymbol)
+#define SYMBOL_P(x) (!SPECIAL_CONST_P(x) && RBASIC(x)->klass == rb_cSymbol)
 VALUE rb_id2sym(ID);
 ID rb_sym2id(VALUE);
 #define ID2SYM(x) rb_id2sym(x)