Add -p like man page says.
diff --git a/bin/lc b/bin/lc
index 0f4ecbf..d9d7193 100755
--- a/bin/lc
+++ b/bin/lc
@@ -1,3 +1,3 @@
 #!/bin/sh
 
-9 ls "$@" | 9 mc
+9 ls -p "$@" | 9 mc