1 files changed, 1 insertions, 1 deletions
diff --git a/rational.c b/rational.c
index 00b4fa74c3..fa03062c06 100644
--- a/rational.c
+++ b/rational.c
@@ -604,7 +604,7 @@ inline static VALUE
 f_imul(long a, long b)
 {
     VALUE r;
-    long c;
+    volatile long c;
 
     if (a == 0 || b == 0)
 	return ZERO;