diff --git a/src/make/gcc.mak b/src/make/gcc.mak
index 6065f6238..89f51e6b3 100644
--- a/src/make/gcc.mak
+++ b/src/make/gcc.mak
@@ -12,6 +12,7 @@ SUBDIRS	=		\
 	ca65		\
 	cc65		\
 	cl65		\
+        co65            \
 	da65		\
 	grc		\
 	ld65		\
diff --git a/src/make/watcom.mak b/src/make/watcom.mak
index b5a86aec6..b416275f1 100644
--- a/src/make/watcom.mak
+++ b/src/make/watcom.mak
@@ -8,6 +8,7 @@ SUBDIRS =	  	\
 	ca65	  	\
 	cc65	  	\
 	cl65	  	\
+        co65            \
         da65            \
 	grc	  	\
 	ld65		\