diff --git a/L1Trigger/CSCCommonTrigger/interface/vmac.h b/L1Trigger/CSCCommonTrigger/interface/vmac.h
index a22313ae30c92..9c2cc70fb9608 100644
--- a/L1Trigger/CSCCommonTrigger/interface/vmac.h
+++ b/L1Trigger/CSCCommonTrigger/interface/vmac.h
@@ -7,6 +7,8 @@ Verilog++ SP.
 #ifndef _VMAC_H_FILE_
 #define _VMAC_H_FILE_
 
+#include "L1Trigger/CSCCommonTrigger/interface/vlib.h"
+
 extern globcontrol glc;
 
 #ifdef VGEN