diff --git a/filters/json b/filters/json
index 1dd948a92..57920344c 100755
--- a/filters/json
+++ b/filters/json
@@ -1,4 +1,4 @@
-#!/usr/bin/env python3
+#!/usr/bin/python3
 
 import json
 import sys
diff --git a/filters/template b/filters/template
index a7d17d60c..9f2c538d6 100755
--- a/filters/template
+++ b/filters/template
@@ -1,4 +1,4 @@
-#!/usr/bin/env perl
+#!/usr/bin/perl
 
 use strict;
 use warnings;
diff --git a/filters/xml b/filters/xml
index 6364d5c37..9c3bc168d 100755
--- a/filters/xml
+++ b/filters/xml
@@ -1,4 +1,4 @@
-#!/usr/bin/env perl
+#!/usr/bin/perl
 
 use strict;
 use warnings;
diff --git a/perl/feedGnuplot b/perl/feedGnuplot
index b16f89c4e..9233c101f 100755
--- a/perl/feedGnuplot
+++ b/perl/feedGnuplot
@@ -1,4 +1,4 @@
-#!/usr/bin/env perl
+#!/usr/bin/perl
 
 package feedgnuplot; # for the metacpan indexer