diff --git a/src/shared/efivars.c b/src/shared/efivars.c
index 1bd8835633c..f16c2db7396 100644
--- a/src/shared/efivars.c
+++ b/src/shared/efivars.c
@@ -909,7 +909,7 @@ bool efi_loader_entry_name_valid(const char *s) {
         if (strlen(s) > FILENAME_MAX) /* Make sure entry names fit in filenames */
                 return false;
 
-        return in_charset(s, ALPHANUMERICAL "-_.");
+        return in_charset(s, ALPHANUMERICAL "+-_.");
 }
 
 char *efi_tilt_backslashes(char *s) {