diff --git a/tools/3dump b/tools/3dump
index 4ac6301..580a9f7 100755
--- a/tools/3dump
+++ b/tools/3dump
@@ -1,4 +1,4 @@
-#!/usr/bin/perl
+#!/usr/bin/env perl
 #
 # Dump a binary PDP-7 file where a word is encoded as three bytes,
 # with sixbits are stored big-endian in each of the three byte.
diff --git a/tools/a7out b/tools/a7out
index a8becaf..ee92b2f 100755
--- a/tools/a7out
+++ b/tools/a7out
@@ -1,4 +1,4 @@
-#!/usr/bin/perl
+#!/usr/bin/env perl
 #
 # a7out: user-mode simulator for PDP-7 Unix applications
 #
diff --git a/tools/as7 b/tools/as7
index b2206ef..473c04f 100755
--- a/tools/as7
+++ b/tools/as7
@@ -1,4 +1,4 @@
-#!/usr/bin/perl
+#!/usr/bin/env perl
 #
 # Read in files of PDP-7 assembly code in Ken Thompson's as format
 # and convert them into PDP-7 machine code
diff --git a/tools/ccov7 b/tools/ccov7
index fea2cf4..baa111a 100755
--- a/tools/ccov7
+++ b/tools/ccov7
@@ -1,4 +1,4 @@
-#!/usr/bin/perl
+#!/usr/bin/env perl
 #
 # Load a code coverage report from SimH and a kernel assembly listing
 # from as7, and show which lines in the kernel were not executed.
diff --git a/tools/fsck7 b/tools/fsck7
index 00f274d..968ae0d 100755
--- a/tools/fsck7
+++ b/tools/fsck7
@@ -1,4 +1,4 @@
-#!/usr/bin/perl
+#!/usr/bin/env perl
 #
 # fsck7: Check a PDP-7 filesystem for consistency
 #
diff --git a/tools/mkfs7 b/tools/mkfs7
index 07cc391..aef67a2 100755
--- a/tools/mkfs7
+++ b/tools/mkfs7
@@ -1,4 +1,4 @@
-#!/usr/bin/perl
+#!/usr/bin/env perl
 #
 # mkfs7: Make a PDP-7 filesystem image for SimH
 #
diff --git a/tools/sdump b/tools/sdump
index 9d10e1a..6d4e032 100755
--- a/tools/sdump
+++ b/tools/sdump
@@ -1,4 +1,4 @@
-#!/usr/bin/perl
+#!/usr/bin/env perl
 #
 # sdump: Dump the contents of a filesystem in SimH format
 #
diff --git a/tools/xref7 b/tools/xref7
index 44ad984..d6338d7 100755
--- a/tools/xref7
+++ b/tools/xref7
@@ -1,4 +1,4 @@
-#!/usr/bin/perl
+#!/usr/bin/env perl
 #
 # Read in files of PDP-7 assembly code in Ken Thompson's as format
 # and output cross-reference and other details on the files.