diff --git a/Lib/gftools/utils.py b/Lib/gftools/utils.py
index 8090b58cf..98f4d4a36 100644
--- a/Lib/gftools/utils.py
+++ b/Lib/gftools/utils.py
@@ -513,10 +513,12 @@ def remove_url_prefix(url):
 
 def primary_script(ttFont, ignore_latin=True):
     g = classifyGlyphs(lambda uv:list(ftunicodedata.script_extension(chr(uv))), ttFont.getBestCmap(), gsub=ttFont.get("GSUB"))
-    if "Zyyy" in g:
-        del g["Zyyy"]
-    if "Latn" in g and ignore_latin:
-        del g["Latn"]
+    badkeys = ["Zinh", "Zyyy", "Zzzz"]
+    if ignore_latin:
+        badkeys.append("Latn")
+    for badkey in badkeys:
+        if badkey in g:
+            del g[badkey]
     script_count = Counter({k:len(v) for k,v in g.items()})
 
     # If there isn't a clear winner, give up