diff --git a/README.md b/README.md
index 6c04240..8bbc6ee 100644
--- a/README.md
+++ b/README.md
@@ -72,6 +72,7 @@ Just like `microbundle build`, but watches your source files and rebuilds on any
     --strict         Enforce undefined global context and add "use strict"
     --name           Specify name exposed in UMD builds
     --cwd            Use an alternative working directory  (default .)
+    --sourcemap      Generate source map  (default true)
     -h, --help       Displays this message
 ```
 
diff --git a/src/cli.js b/src/cli.js
index 95b04c0..2561ce2 100644
--- a/src/cli.js
+++ b/src/cli.js
@@ -18,7 +18,8 @@ prog
 	.option('--compress', 'Compress output using UglifyJS', true)
 	.option('--strict', 'Enforce undefined global context and add "use strict"')
 	.option('--name', 'Specify name exposed in UMD builds')
-	.option('--cwd', 'Use an alternative working directory', '.');
+	.option('--cwd', 'Use an alternative working directory', '.')
+	.option('--sourcemap', 'Generate source map', true);
 
 prog
 	.command('build [...entries]', '', { default: true })
diff --git a/src/index.js b/src/index.js
index 2209d03..fb889ee 100644
--- a/src/index.js
+++ b/src/index.js
@@ -310,7 +310,7 @@ function createConfig(options, entry, format, writeMeta) {
 			strict: options.strict===true,
 			legacy: true,
 			freeze: false,
-			sourcemap: true,
+			sourcemap: options.sourcemap!==false,
 			treeshake: {
 				propertyReadSideEffects: false
 			},