diff --git a/main.go b/main.go
index 94723bca9..03d839942 100644
--- a/main.go
+++ b/main.go
@@ -218,6 +218,7 @@ func run(args []string, onTerminate func(int)) {
 		EnumVar(&globals.PromptDriver, promptsAvailable...)
 
 	app.Flag("biometrics", "Use biometric authentication if supported").
+		OverrideDefaultFromEnvar("AWS_VAULT_BIOMETRICS").
 		BoolVar(&globals.Biometrics)
 
 	app.PreAction(func(c *kingpin.ParseContext) (err error) {