diff --git a/object/check.go b/object/check.go
index 44f8a311..c18403a0 100644
--- a/object/check.go
+++ b/object/check.go
@@ -326,6 +326,11 @@ func CheckUsername(username string) string {
 		return "Username is too long (maximum is 39 characters)."
 	}
 
+	exclude, _ := regexp.Compile("^[\u0021-\u007E]+$")
+	if !exclude.MatchString(username) {
+		return ""
+	}
+
 	// https://stackoverflow.com/questions/58726546/github-username-convention-using-regex
 	re, _ := regexp.Compile("^[a-zA-Z0-9]+((?:-[a-zA-Z0-9]+)|(?:_[a-zA-Z0-9]+))*$")
 	if !re.MatchString(username) {