diff --git a/scripts/run_postgres b/scripts/run_postgres
index b54f897981..aea056029b 100755
--- a/scripts/run_postgres
+++ b/scripts/run_postgres
@@ -1,7 +1,7 @@
-#!/bin/sh
+#!/bin/bash
 
 # on Windows, docker run needs to be prefixed by winpty
-if [[ "$OSTYPE" == "msys" ]]; then
+if [ "$OSTYPE" == "msys" ]; then
 	DOCKER="winpty docker"
 else
 	DOCKER=${DOCKER:-docker}
diff --git a/scripts/run_tests b/scripts/run_tests
index 2245326840..9827605f57 100755
--- a/scripts/run_tests
+++ b/scripts/run_tests
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 cd $(dirname $0)
 
@@ -7,7 +7,7 @@ docker build -t aries-cloudagent-test -f ../docker/Dockerfile.test .. || exit 1
 if [ ! -d ../test-reports ]; then mkdir ../test-reports; fi
 
 # on Windows, docker run needs to be prefixed by winpty
-if [[ "$OSTYPE" == "msys" ]]; then
+if [ "$OSTYPE" == "msys" ]; then
   DOCKER="winpty docker"
 else
   DOCKER="docker"
diff --git a/scripts/run_tests_indy b/scripts/run_tests_indy
index 42a0243117..1cada05a62 100755
--- a/scripts/run_tests_indy
+++ b/scripts/run_tests_indy
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 cd $(dirname $0)
 
@@ -7,7 +7,7 @@ docker build -t aries-cloudagent-test -f ../docker/Dockerfile.test-indy .. || ex
 if [ ! -d ../test-reports ]; then mkdir ../test-reports; fi
 
 # on Windows, docker run needs to be prefixed by winpty
-if [[ "$OSTYPE" == "msys" ]]; then
+if [ "$OSTYPE" == "msys" ]; then
   DOCKER="winpty docker"
 else
   DOCKER="docker"