diff --git a/perl/greedy/makefile b/perl/greedy/makefile
index bfbae27..8d1d078 100644
--- a/perl/greedy/makefile
+++ b/perl/greedy/makefile
@@ -1,2 +1,5 @@
+SRC:=tsp.pl
+TEST_FILE:=a280.tsp
+
 run:
-	perl tsp.pl a280.tsp 
+	perl tsp.pl $(TEST_FILE)