diff --git a/.editorconfig b/.editorconfig
index 21985b5..c6b90d4 100644
--- a/.editorconfig
+++ b/.editorconfig
@@ -8,3 +8,7 @@ end_of_line = lf
 charset = utf-8
 trim_trailing_whitespace = false
 insert_final_newline = true
+
+[*.{bat,cmd}]
+end_of_line = crlf
+charset = latin1
diff --git a/.travis.yml b/.travis.yml
index f8c318a..afa3cde 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -24,7 +24,7 @@ jobs:
       language: go
       go: '1.13'
       before_script: GO111MODULE=on go install mvdan.cc/sh/v3/cmd/shfmt
-      script: shfmt -d -s -ln posix -i 0 -ci -kp install-php-extensions scripts/common scripts/travisci-test-extensions scripts/travisci-update-readme scripts/update-readme
+      script: shfmt -d -s -ln posix -i 0 -ci -kp install-php-extensions scripts/common scripts/lint scripts/travisci-test-extensions scripts/travisci-update-readme scripts/update-readme
 
     - <<: *test-extensions-job-template
       name: Test extensions on Alpine 3.7
diff --git a/README.md b/README.md
index 69ac319..de913fc 100644
--- a/README.md
+++ b/README.md
@@ -144,6 +144,10 @@ Some extension has special requirements:
 
 ## How to contribute
 
+### Formatting code
+
+Before submitting any pull request, be sure to execute the `lint` script in the `scripts` directory (or `lint.bat` on Windows).
+
 ### Adding support to a new PHP extension?
 
 1. change the `install-php-extensions` script
diff --git a/scripts/Dockerfile-shfmt b/scripts/Dockerfile-shfmt
new file mode 100644
index 0000000..5decefa
--- /dev/null
+++ b/scripts/Dockerfile-shfmt
@@ -0,0 +1,3 @@
+FROM golang
+
+RUN go get github.com/mvdan/sh/cmd/shfmt
diff --git a/scripts/lint b/scripts/lint
new file mode 100755
index 0000000..3499919
--- /dev/null
+++ b/scripts/lint
@@ -0,0 +1,30 @@
+#!/bin/sh
+
+set -o errexit
+set -o nounset
+
+if ! docker --version >/dev/null 2>/dev/null; then
+	printf 'Docker is not installed, or it is not running\n' >&2
+	exit 1
+fi
+
+#SRC_DIR="$(CDPATH= cd -- "$(dirname -- "$0")" && cd .. pwd)"
+
+if ! docker build -t docker-php-extension-installer-shfmt:latest -f scripts/Dockerfile-shfmt -q .; then
+	printf 'ERROR!' >&2
+	exit 1
+fi
+
+fix() {
+	printf 'Fixing %s... ' "$1"
+	if docker run --rm -v "$SRC_DIR:/src" -w /src docker-php-extension-installer-shfmt:latest shfmt -s -ln posix -i 0 -ci -kp -w "$1"; then
+		printf 'done.\n'
+	fi
+}
+
+fix install-php-extensions
+fix scripts/common
+fix scripts/lint
+fix scripts/travisci-test-extensions
+fix scripts/travisci-update-readme
+fix scripts/update-readme
diff --git a/scripts/lint.bat b/scripts/lint.bat
new file mode 100644
index 0000000..19d9e55
--- /dev/null
+++ b/scripts/lint.bat
@@ -0,0 +1,34 @@
+@echo off
+setlocal
+
+docker --version >NUL 2>NUL
+if errorlevel 1 goto :no-docker
+
+cd /d "%~dp0.."
+if errorlevel 1 goto err
+set SRC_DIR=%CD%
+
+docker build -t docker-php-extension-installer-shfmt:latest -f scripts\Dockerfile-shfmt -q .
+if errorlevel 1 goto :err
+
+call :fix install-php-extensions
+call :fix scripts/common
+call :fix scripts/lint
+call :fix scripts/travisci-test-extensions
+call :fix scripts/travisci-update-readme
+call :fix scripts/update-readme
+goto :eof
+
+:no-docker
+echo Docker is not installed, or it's not running >&2
+goto :eof
+
+:err
+echo ERROR! >&2
+goto :eof
+
+:fix
+echo|set /p="Fixing %1... "
+docker run --rm -v "%SRC_DIR%:/src" -w /src docker-php-extension-installer-shfmt:latest shfmt -s -ln posix -i 0 -ci -kp -w %1
+if not errorlevel 1 echo done.
+exit /b 0