diff --git a/tc/Makefile b/tc/Makefile
index 00abb7f3..a3d270db 100644
--- a/tc/Makefile
+++ b/tc/Makefile
@@ -89,6 +89,7 @@ endif
 
 YACC := bison
 LEX := flex
+CFLAGS += -DYY_NO_INPUT
 
 MODDESTDIR := $(DESTDIR)$(patsubst /usr%,%,$(LIBDIR))/tc