diff --git a/src/u-blox_external_typedefs.h b/src/u-blox_external_typedefs.h
index d863b05..38dcac5 100644
--- a/src/u-blox_external_typedefs.h
+++ b/src/u-blox_external_typedefs.h
@@ -254,7 +254,7 @@ struct sfe_ublox_ubx_logging_list_t
 
 #ifndef MAX_PAYLOAD_SIZE
 // v2.0: keep this for backwards-compatibility, but this is largely superseded by setPacketCfgPayloadSize
-#define MAX_PAYLOAD_SIZE 276 // We need >=250 bytes for getProtocolVersion on the NEO-F10N
+#define MAX_PAYLOAD_SIZE 512 // We need >=288 bytes for getModuleInfo on the ZED-X20P
 // #define MAX_PAYLOAD_SIZE 768 //Worst case: UBX_CFG_VALSET packet with 64 keyIDs each with 64 bit values
 #endif