diff --git a/src/libCom/Makefile b/src/libCom/Makefile
index d7835deea..997b74a25 100644
--- a/src/libCom/Makefile
+++ b/src/libCom/Makefile
@@ -48,6 +48,7 @@ include $(TOP)/configure/RULES
 
 include $(LIBCOM)/env/RULES
 include $(LIBCOM)/error/RULES
+include $(LIBCOM)/flex/RULES
 include $(LIBCOM)/log/RULES
 include $(LIBCOM)/misc/RULES
 include $(LIBCOM)/osi/RULES
diff --git a/src/libCom/flex/RULES b/src/libCom/flex/RULES
index 3b299d8d8..6cf044524 100644
--- a/src/libCom/flex/RULES
+++ b/src/libCom/flex/RULES
@@ -10,7 +10,7 @@
 # This is a Makefile fragment, see src/libCom/Makefile.
 
 # Ensure that the lexer is built before it is needed
-parse.c: $(call PATH_FILTER, $(TOOLS)/antelope$(HOSTEXE))
+parse.c: $(YACC)
 
 clean::
 	$(RM) parse.c parse.h