diff --git a/src/ar65/make/watcom.mak b/src/ar65/make/watcom.mak
index 7826fdcbb..52f6fef9d 100644
--- a/src/ar65/make/watcom.mak
+++ b/src/ar65/make/watcom.mak
@@ -52,6 +52,10 @@ CCCFG  = -bt=$(TARGET) -d1 -onatx -zp4 -5 -zq -w2
 !else
 !error
 !endif
+	       
+# Add the include dir
+CCCFG	= $(CCCFG) -i=..\common
+
 
 # ------------------------------------------------------------------------------
 # Implicit rules
diff --git a/src/ca65/make/watcom.mak b/src/ca65/make/watcom.mak
index bc9539964..623b61566 100644
--- a/src/ca65/make/watcom.mak
+++ b/src/ca65/make/watcom.mak
@@ -53,6 +53,10 @@ CCCFG  = -bt=$(TARGET) -d1 -onatx -zp4 -5 -zq -w2
 !error
 !endif
 
+# Add the include dir
+CCCFG	= $(CCCFG) -i=..\common
+
+
 # ------------------------------------------------------------------------------
 # Implicit rules
 
diff --git a/src/cc65/make/watcom.mak b/src/cc65/make/watcom.mak
index 16d1098cd..ec7a9c038 100644
--- a/src/cc65/make/watcom.mak
+++ b/src/cc65/make/watcom.mak
@@ -53,6 +53,10 @@ CCCFG  = -bt=$(TARGET) -d1 -onatx -zp4 -5 -zq -w2
 !error
 !endif
 
+# Add the include dir
+CCCFG	= $(CCCFG) -i=..\common
+
+
 # ------------------------------------------------------------------------------
 # Implicit rules
 
diff --git a/src/ld65/make/watcom.mak b/src/ld65/make/watcom.mak
index 4849a82a4..e0bc92bb7 100644
--- a/src/ld65/make/watcom.mak
+++ b/src/ld65/make/watcom.mak
@@ -53,6 +53,10 @@ CCCFG  = -bt=$(TARGET) -d1 -onatx -zp4 -5 -zq -w2
 !error
 !endif
 
+# Add the include dir
+CCCFG	= $(CCCFG) -i=..\common
+
+
 # ------------------------------------------------------------------------------
 # Implicit rules