diff --git a/Makefile b/Makefile
index a83d416..aa865f5 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,5 @@
 frfac:
-	sed '1s@^.*$$@\#\!'$$(latest_perl)@ frfac.in > frfac
+	sed '1s@^.*$$@\#\!'$$(./latest_perl)@ frfac.in > frfac
 
 check:
 	`./latest_perl` -wc frfac.in