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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 200a648738..189f2fc8e1 100644
--- a/include/ruby/ruby.h
+++ b/include/ruby/ruby.h
@@ -336,7 +336,7 @@ rb_long2int_inline(long n)
#define FIX2LONG(x) (long)RSHIFT((SIGNED_VALUE)(x),1)
#define FIX2ULONG(x) ((((VALUE)(x))>>1)&LONG_MAX)
-#define FIXNUM_P(f) (((SIGNED_VALUE)(f))&FIXNUM_FLAG)
+#define FIXNUM_P(f) (((int)(SIGNED_VALUE)(f))&FIXNUM_FLAG)
#define POSFIXABLE(f) ((f) < FIXNUM_MAX+1)
#define NEGFIXABLE(f) ((f) >= FIXNUM_MIN)
#define FIXABLE(f) (POSFIXABLE(f) && NEGFIXABLE(f))