diff --git a/filters/hldiff b/filters/hldiff
index 64e95d2..dc8c727 100755
--- a/filters/hldiff
+++ b/filters/hldiff
@@ -1,4 +1,5 @@
-# vim: set ft=awk :
+#!/usr/bin/awk -f
+
 BEGIN {
 	bright = "\x1B[1m"
 	red = "\x1B[31m"
diff --git a/filters/plaintext b/filters/plaintext
index cfaa170..922ae7c 100755
--- a/filters/plaintext
+++ b/filters/plaintext
@@ -1,4 +1,5 @@
-# vim: set ft=awk :
+#!/usr/bin/awk -f
+
 BEGIN {
 	dim = "\x1B[2m"
 	cyan = "\x1B[36m"