diff --git a/openair2/COMMON/mac_messages_types.h b/openair2/COMMON/mac_messages_types.h
index 9b8bac373f8d1846b992500ed32d07409827a77b..e0eb258104d5222d81c7d9399a64fdcb40af20d8 100644
--- a/openair2/COMMON/mac_messages_types.h
+++ b/openair2/COMMON/mac_messages_types.h
@@ -53,9 +53,9 @@
 #define RRC_MAC_MCCH_DATA_IND(mSGpTR)           (mSGpTR)->ittiMsg.rrc_mac_mcch_data_ind
 
 // Some constants from "LAYER2/MAC/defs.h"
-#define BCCH_SDU_SIZE                           (128)
-#define CCCH_SDU_SIZE                           (128)
-#define MCCH_SDU_SIZE                           (128)
+#define BCCH_SDU_SIZE                           (512)
+#define CCCH_SDU_SIZE                           (512)
+#define MCCH_SDU_SIZE                           (512)
 
 //-------------------------------------------------------------------------------------------//
 // Messages between RRC and MAC layers