diff --git a/src/backend/lib/stringinfo.c b/src/backend/lib/stringinfo.c
index b618b37..a1d786d 100644
--- a/src/backend/lib/stringinfo.c
+++ b/src/backend/lib/stringinfo.c
@@ -313,13 +313,13 @@ enlargeStringInfo(StringInfo str, int needed)
 	 * for efficiency, double the buffer size each time it overflows.
 	 * Actually, we might need to more than double it if 'needed' is big...
 	 */
-	newlen = 2 * str->maxlen;
+	newlen = 2 * (Size) str->maxlen;
 	while (needed > newlen)
 		newlen = 2 * newlen;
 
 	/*
 	 * Clamp to the limit in case we went past it.  Note we are assuming here
-	 * that limit <= INT_MAX/2, else the above loop could overflow.  We will
+	 * that limit <= UINT_MAX/2, else the above loop could overflow.  We will
 	 * still have newlen >= needed.
 	 */
 	if (newlen > limit)