diff --git a/sbin/ipfw/ipfw2.c b/sbin/ipfw/ipfw2.c
index 26ffb42b0e69..00c38002f07e 100644
--- a/sbin/ipfw/ipfw2.c
+++ b/sbin/ipfw/ipfw2.c
@@ -3424,7 +3424,8 @@ config_pipe(int ac, char **av)
 				end++;
 				p.bandwidth *= 1000000;
 			    }
-			    if (*end == 'B' ||
+			    if ((*end == 'B' &&
+				  _substrcmp2(end, "Bi", "Bit/s") != 0) ||
 			        _substrcmp2(end, "by", "bytes") == 0)
 				p.bandwidth *= 8;
 			    if (p.bandwidth < 0)