1 files changed, 3 insertions, 4 deletions
diff --git a/math.c b/math.c
index 2b877ec64e..1a448b8713 100644
--- a/math.c
+++ b/math.c
@@ -666,14 +666,13 @@ math_gamma(VALUE obj, VALUE x)
     };
     double d0, d;
     double intpart, fracpart;
-    int n;
     Need_Float(x);
     d0 = RFLOAT_VALUE(x);
     fracpart = modf(d0, &intpart);
     if (fracpart == 0.0 &&
-	0 < intpart &&
-	(n = (int)intpart - 1) < numberof(fact_table)) {
-        return DBL2NUM(fact_table[n]);
+        0 < intpart &&
+        intpart - 1 < (double)numberof(fact_table)) {
+        return DBL2NUM(fact_table[(int)intpart - 1]);
     }
     errno = 0;
     d = tgamma(d0);