diff --git a/misc/fuel/factor-mode.el b/misc/fuel/factor-mode.el
index 59cd8f311d..3bb8906045 100644
--- a/misc/fuel/factor-mode.el
+++ b/misc/fuel/factor-mode.el
@@ -304,7 +304,7 @@ source/docs/tests file. When set to false, you'll be asked only once."
   "\\(TUPLE\\):[ \n\t]+\\(\\w+\\)[ \n\t]+\\([^;]+\\);")
 
 (defconst factor-subclassed-tuple-decl-regex
-  "\\(TUPLE\\):[ \n\t]++\\(\\(?:\\sw\\|\\s_\\)+\\)[ \n\t]+<[ \n\t]+\\(\\(?:\\sw\\|\\s_\\)+\\)[ \n\t]+\\([^;]+\\);")
+  "\\(TUPLE\\):[ \n\t]+\\(\\(?:\\sw\\|\\s_\\)+\\)[ \n\t]+<[ \n\t]+\\(\\(?:\\sw\\|\\s_\\)+\\)[ \n\t]+\\([^;]+\\);")
 
 (defconst factor-constructor-regex
   "<[^ >]+>")