diff --git a/include/configs/apalis_t30.h b/include/configs/apalis_t30.h
index 8c76605f8bc0deb863456fd6a0a4a014be8614d6..3fc177906bcfacb6b9d733dcd37e02312e7dc48f 100644
--- a/include/configs/apalis_t30.h
+++ b/include/configs/apalis_t30.h
@@ -52,7 +52,7 @@
 
 /* General networking support */
 #define CONFIG_IP_DEFRAG
-#define CONFIG_TFTP_BLOCKSIZE		16384
+#define CONFIG_TFTP_BLOCKSIZE		16352
 #define CONFIG_TFTP_TSIZE
 
 /* Miscellaneous commands */
diff --git a/include/configs/colibri_imx7.h b/include/configs/colibri_imx7.h
index ba1adea364a96a885f87735b0a8e9389535f65ff..b628d11fe9df280a543b0dbc7ded898d51fbe7e1 100644
--- a/include/configs/colibri_imx7.h
+++ b/include/configs/colibri_imx7.h
@@ -44,9 +44,9 @@
 
 #define CONFIG_PHYLIB
 #define CONFIG_PHY_MICREL
-#define CONFIG_TFTP_TSIZE
 #define CONFIG_IP_DEFRAG
-#define CONFIG_TFTP_BLOCKSIZE		16384
+#define CONFIG_TFTP_BLOCKSIZE		16352
+#define CONFIG_TFTP_TSIZE
 
 /* ENET1 */
 #define IMX_FEC_BASE			ENET_IPS_BASE_ADDR
diff --git a/include/configs/colibri_t30.h b/include/configs/colibri_t30.h
index 3431cde62fb7440bcfd5b55f139432dfcef588be..e2a2549fb65cad8cda812805a8b4c585123d25b9 100644
--- a/include/configs/colibri_t30.h
+++ b/include/configs/colibri_t30.h
@@ -48,8 +48,7 @@
 
 /* General networking support */
 #define CONFIG_IP_DEFRAG
-#define CONFIG_NET_MAXDEFRAG		(16384 + 4096 + 24)
-#define CONFIG_TFTP_BLOCKSIZE		16384
+#define CONFIG_TFTP_BLOCKSIZE		16352
 #define CONFIG_TFTP_TSIZE
 
 /* Miscellaneous commands */