diff --git a/contrib/pgcrypto/encode.c b/contrib/pgcrypto/encode.c
index 7a575dacd149ec96eac5e7f488c087a9c44686d8..dcd3edea16c8dd3997f3a75bf28934ba6611ec87 100644
--- a/contrib/pgcrypto/encode.c
+++ b/contrib/pgcrypto/encode.c
@@ -26,7 +26,7 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- * $Id: encode.c,v 1.5 2001/05/13 02:17:09 momjian Exp $
+ * $Id: encode.c,v 1.6 2001/05/15 04:45:15 momjian Exp $
  */
 
 #include "postgres.h"
@@ -349,7 +349,8 @@ hex_dec_len(uint srclen)
 uint
 b64_enc_len(uint srclen)
 {
-	return srclen + (srclen + 2 / 3) + (srclen / (76 / 2)) + 2;
+	/* 3 bytes will be converted to 4, linefeed after 76 chars */
+	return (srclen + 2) * 4 / 3 + srclen / (76 * 3 / 4);
 }
 
 uint