diff --git a/drivers/net/designware.c b/drivers/net/designware.c
index 01abcc2..2c5d956 100644
--- a/drivers/net/designware.c
+++ b/drivers/net/designware.c
@@ -380,9 +380,11 @@
 		return -EPERM;
 	}
 
-	length = max(length, ETH_ZLEN);
-
 	memcpy((void *)data_start, packet, length);
+	if (length < ETH_ZLEN) {
+		memset(&((char *)data_start)[length], 0, ETH_ZLEN - length);
+		length = ETH_ZLEN;
+	}
 
 	/* Flush data to be sent */
 	flush_dcache_range(data_start, data_end);