diff --git a/contrib/pgcrypto/pgp-armor.c b/contrib/pgcrypto/pgp-armor.c
index 679779a6ac..9128756647 100644
--- a/contrib/pgcrypto/pgp-armor.c
+++ b/contrib/pgcrypto/pgp-armor.c
@@ -165,7 +165,7 @@ pg_base64_enc_len(unsigned srclen)
 	/*
 	 * 3 bytes will be converted to 4, linefeed after 76 chars
 	 */
-	return (srclen + 2) * 4 / 3 + srclen / (76 * 3 / 4);
+	return (srclen + 2) / 3 * 4 + srclen / (76 * 3 / 4);
 }
 
 static unsigned
diff --git a/src/backend/utils/adt/encode.c b/src/backend/utils/adt/encode.c
index b92191de81..e5ac3ad23d 100644
--- a/src/backend/utils/adt/encode.c
+++ b/src/backend/utils/adt/encode.c
@@ -385,7 +385,7 @@ static uint64
 pg_base64_enc_len(const char *src, size_t srclen)
 {
 	/* 3 bytes will be converted to 4, linefeed after 76 chars */
-	return ((uint64) srclen + 2) * 4 / 3 + (uint64) srclen / (76 * 3 / 4);
+	return ((uint64) srclen + 2) / 3 * 4 + (uint64) srclen / (76 * 3 / 4);
 }
 
 static uint64
diff --git a/src/common/base64.c b/src/common/base64.c
index 2943ac7652..ec4eb49382 100644
--- a/src/common/base64.c
+++ b/src/common/base64.c
@@ -224,7 +224,7 @@ int
 pg_b64_enc_len(int srclen)
 {
 	/* 3 bytes will be converted to 4 */
-	return (srclen + 2) * 4 / 3;
+	return (srclen + 2) / 3 * 4;
 }
 
 /*