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..5545520 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: ./scripts/invoke-shfmt check
 
     - <<: *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/invoke-shfmt b/scripts/invoke-shfmt
new file mode 100755
index 0000000..801c6f6
--- /dev/null
+++ b/scripts/invoke-shfmt
@@ -0,0 +1,28 @@
+#!/bin/sh
+
+set -o errexit
+set -o nounset
+
+PARAMS='-s -ln posix -i 0 -ci -kp'
+
+case "${1:-}" in
+	check)
+		PARAMS="$PARAMS -d"
+		;;
+	fix)
+		PARAMS="$PARAMS -w"
+		;;
+	*)
+		fprintf 'Syntax: %s <check|fix>' "$0" >&2
+		exit 1
+		;;
+esac
+
+shfmt $PARAMS \
+	install-php-extensions \
+	scripts/common \
+	scripts/invoke-shfmt \
+	scripts/lint \
+	scripts/travisci-test-extensions \
+	scripts/travisci-update-readme \
+	scripts/update-readme
diff --git a/scripts/lint b/scripts/lint
new file mode 100755
index 0000000..01edbeb
--- /dev/null
+++ b/scripts/lint
@@ -0,0 +1,16 @@
+#!/bin/sh
+
+set -o errexit
+set -o nounset
+
+if ! docker --version >/dev/null 2>/dev/null; then
+	printf 'Docker is not installed, or it is not running\n' >&2
+	exit 1
+fi
+
+SRC_DIR="$(CDPATH= cd -- "$(dirname -- "$0")" && cd .. pwd)"
+
+if ! docker run --rm -v "$SRC_DIR:/src" -w /src --entrypoint /src/scripts/invoke-shfmt mvdan/shfmt:latest fix; then
+	printf 'ERROR!' >&2
+	exit 1
+fi
diff --git a/scripts/lint.bat b/scripts/lint.bat
new file mode 100644
index 0000000..80a6386
--- /dev/null
+++ b/scripts/lint.bat
@@ -0,0 +1,21 @@
+@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 run --rm -v "%SRC_DIR%:/src" -w /src --entrypoint /src/scripts/invoke-shfmt mvdan/shfmt:latest fix
+if errorlevel 1 goto :err
+goto :eof
+
+:no-docker
+echo Docker is not installed, or it's not running >&2
+goto :eof
+
+:err
+echo ERROR! >&2
+goto :eof