diff --git a/main.go b/main.go
index 8946e83a..3de9534f 100644
--- a/main.go
+++ b/main.go
@@ -26,7 +26,7 @@ var (
 )
 
 func setupFlags(app *kingpin.Application) {
-	app.Flag("config", "Load JSON configuration from file.").Action(loadConfig).String()
+	app.Flag("config", "Load JSON configuration from file.").Envar("GOMETALINTER_CONFIG").Action(loadConfig).String()
 	app.Flag("disable", "Disable previously enabled linters.").PlaceHolder("LINTER").Short('D').Action(disableAction).Strings()
 	app.Flag("enable", "Enable previously disabled linters.").PlaceHolder("LINTER").Short('E').Action(enableAction).Strings()
 	app.Flag("linter", "Define a linter.").PlaceHolder("NAME:COMMAND:PATTERN").Action(cliLinterOverrides).StringMap()