diff --git a/misc/fuel/factor-mode.el b/misc/fuel/factor-mode.el
index 74c47f9ee6..4ba9496700 100644
--- a/misc/fuel/factor-mode.el
+++ b/misc/fuel/factor-mode.el
@@ -799,18 +799,20 @@ With prefix, non-existing files will be created."
     (modify-syntax-entry ?$ "_" table)
     (modify-syntax-entry ?@ "_" table)
     (modify-syntax-entry ?? "_" table)
-    (modify-syntax-entry ?_ "w" table)
+    (modify-syntax-entry ?_ "_" table)
     (modify-syntax-entry ?: "_" table)
     (modify-syntax-entry ?< "_" table)
     (modify-syntax-entry ?> "_" table)
+    (modify-syntax-entry ?. "_" table)
+    (modify-syntax-entry ?, "_" table)
     (modify-syntax-entry ?& "_" table)
     (modify-syntax-entry ?| "_" table)
     (modify-syntax-entry ?% "_" table)
     (modify-syntax-entry ?= "_" table)
     (modify-syntax-entry ?/ "_" table)
     (modify-syntax-entry ?+ "_" table)
-    (modify-syntax-entry ?* "w" table)
-    (modify-syntax-entry ?- "w" table)
+    (modify-syntax-entry ?* "_" table)
+    (modify-syntax-entry ?- "_" table)
     (modify-syntax-entry ?\; "_" table)
     (modify-syntax-entry ?\( "()" table)
     (modify-syntax-entry ?\) ")(" table)