diff --git a/Makefile b/Makefile
index 8d27ff6..5020ece 100644
--- a/Makefile
+++ b/Makefile
@@ -30,7 +30,7 @@ bc/bc.c: bc/y.tab.c bc/yyval.sed
 	$(SED) -f bc/yyval.sed $< > $@
 
 bc/y.tab.c: bc/bc.y
-	cd bc && yacc bc.y
+	cd bc && $(YACC) bc.y
 
 .c.o:
 	$(CC) -c $(CFLAGS) $(CPPFLAGS) -o $@ $<