diff --git a/defaults/values.go b/defaults/values.go
index 1f0fc1d..4f0c278 100644
--- a/defaults/values.go
+++ b/defaults/values.go
@@ -174,7 +174,7 @@ func NewHTTPBodyReader(readJSON, useUsernameNotEmail bool) *HTTPBodyReader {
 		pidRules = Rules{
 			FieldName: pid, Required: true,
 			MatchError: "Must be a valid e-mail address",
-			MustMatch:  regexp.MustCompile(`.*@.*\.[a-z]{1,}`),
+			MustMatch:  regexp.MustCompile(`.*@.*\.[a-z]+`),
 		}
 	}