diff --git a/src/cl65/make/watcom.mak b/src/cl65/make/watcom.mak
index bce889458..6fdb86f0c 100644
--- a/src/cl65/make/watcom.mak
+++ b/src/cl65/make/watcom.mak
@@ -53,6 +53,9 @@ CCCFG  = -bt=$(TARGET) -d1 -onatx -zp4 -5 -zq -w2
 !error
 !endif
 
+# Add the include dir
+CCCFG	= $(CCCFG) -i=..\common
+
 # ------------------------------------------------------------------------------
 # Implicit rules