diff --git a/bacnet-stack/datalink.h b/bacnet-stack/datalink.h
index 9723d6ad..4764749a 100644
--- a/bacnet-stack/datalink.h
+++ b/bacnet-stack/datalink.h
@@ -48,9 +48,6 @@
 #include "dlmstp.h"
 #elif defined(BACDL_BIP)
 #include "bip.h"
-#else
-#define MAX_HEADER (1 + 1 + 2)
-#define MAX_MPDU (MAX_HEADER+MAX_PDU)
 #endif
 
 #ifdef __cplusplus