diff --git a/ext/standard/math.c b/ext/standard/math.c
index 135b87eb569..a4df5a5aa6d 100644
--- a/ext/standard/math.c
+++ b/ext/standard/math.c
@@ -608,7 +608,7 @@ PHP_FUNCTION(pow)
 
 		/* calculate pow(long,long) in O(log exp) operations, bail if overflow */
 		while (i >= 1) {
-			int overflow;
+			long overflow;
 			double dval = 0.0;
 
 			if (i % 2) {