diff --git a/assemble_synApps b/assemble_synApps
index f7deb8e..b9484e6 100755
--- a/assemble_synApps
+++ b/assemble_synApps
@@ -171,6 +171,8 @@ sub do_substitution {
 	}
 	close (IN);
 	close (OUT);
+	
+	unlink($file . '.bak');
 }