diff --git a/src/algo/L b/src/algo/L
index cc2bd36..fa3618d 100644
--- a/src/algo/L
+++ b/src/algo/L
@@ -1,3 +1,3 @@
-#!/bin/sh
+#!/bin/bash
 # give no ids for output since relax only handles one single avalanche
 algo/fix l $2 | io/avalanches_bin2human $1
diff --git a/src/algo/S b/src/algo/S
index e1f3077..620ccc1 100755
--- a/src/algo/S
+++ b/src/algo/S
@@ -1,2 +1,2 @@
-#!/bin/sh
+#!/bin/bash
 algo/fix s $1
diff --git a/src/algo/is_recurrent b/src/algo/is_recurrent
index 3bbd1a5..268fdd1 100755
--- a/src/algo/is_recurrent
+++ b/src/algo/is_recurrent
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 #RETURN_VALUE=./algo/burning_test>/dev/null
 ./algo/burning_test>/dev/null
diff --git a/src/algo/l b/src/algo/l
index 027aac5..b92a796 100755
--- a/src/algo/l
+++ b/src/algo/l
@@ -1,3 +1,3 @@
-#!/bin/sh
+#!/bin/bash
 # give no ids for output since relax only handles one single avalanche
 algo/relax l $2 $3 | io/avalanches_bin2human $1
diff --git a/src/algo/s b/src/algo/s
index 3c431a6..f895ed5 100644
--- a/src/algo/s
+++ b/src/algo/s
@@ -1,2 +1,2 @@
-#!/bin/sh
+#!/bin/bash
 algo/relax s $1 $2
diff --git a/src/algo/throw b/src/algo/throw
index 5ff1870..6ea4b91 100755
--- a/src/algo/throw
+++ b/src/algo/throw
@@ -1,2 +1,2 @@
-#!/bin/sh
+#!/bin/bash
 math/add $1 | algo/relax s $1 $2
diff --git a/src/ca/ca_file b/src/ca/ca_file
index d74bb72..9c8e4d8 100755
--- a/src/ca/ca_file
+++ b/src/ca/ca_file
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 FILENAME=$1
 shift
 ./ca/ca "`cat $FILENAME`" $*
diff --git a/src/core/diff2 b/src/core/diff2
index cdd49a7..c6db63a 100755
--- a/src/core/diff2
+++ b/src/core/diff2
@@ -1,2 +1,2 @@
-#!/bin/sh
+#!/bin/bash
 math/comb sub "$*" | core/all_equals 0
diff --git a/src/io/to_image b/src/io/to_image
index e6eb889..228625e 100755
--- a/src/io/to_image
+++ b/src/io/to_image
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 usage ()
 {
 	echo "Converts a grid into an image known by ImageMagick"
diff --git a/src/io/to_ods b/src/io/to_ods
index 62b84d9..b7059a2 100755
--- a/src/io/to_ods
+++ b/src/io/to_ods
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 usage ()
 {
 	echo "Converts a grid into an ODS table file for OpenOffice"
diff --git a/src/io/to_pdf b/src/io/to_pdf
index 97677c2..7636ffa 100755
--- a/src/io/to_pdf
+++ b/src/io/to_pdf
@@ -1,2 +1,2 @@
-#!/bin/sh
+#!/bin/bash
 cat > $1.csv && oocalc --convert-to pdf $1.csv
diff --git a/src/math/add2 b/src/math/add2
index 88bcf51..33a457b 100755
--- a/src/math/add2
+++ b/src/math/add2
@@ -1,2 +1,2 @@
-#!/bin/sh
+#!/bin/bash
 math/comb add "$*"
diff --git a/src/math/coords b/src/math/coords
index 8487156..ef88dbd 100755
--- a/src/math/coords
+++ b/src/math/coords
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 usage ()
 {
diff --git a/src/math/sub2 b/src/math/sub2
index ad18027..67dee67 100755
--- a/src/math/sub2
+++ b/src/math/sub2
@@ -1,2 +1,2 @@
-#!/bin/sh
+#!/bin/bash
 math/comb sub "$*"