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-rw-r--r--include/ruby/ruby.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/ruby/ruby.h b/include/ruby/ruby.h
index a37eb349f3..6de6ba02e6 100644
--- a/include/ruby/ruby.h
+++ b/include/ruby/ruby.h
@@ -291,7 +291,7 @@ VALUE rb_ull2inum(unsigned LONG_LONG);
#define SYMBOL_P(x) (((VALUE)(x)&~(~(VALUE)0<<RUBY_SPECIAL_SHIFT))==SYMBOL_FLAG)
#define ID2SYM(x) (((VALUE)(x)<<RUBY_SPECIAL_SHIFT)|SYMBOL_FLAG)
-#define SYM2ID(x) RSHIFT((unsigned long)x,RUBY_SPECIAL_SHIFT)
+#define SYM2ID(x) RSHIFT((unsigned long)(x),RUBY_SPECIAL_SHIFT)
/* Module#methods, #singleton_methods and so on return Symbols */
#define USE_SYMBOL_AS_METHOD_NAME 1