diff --git a/scripts/umap-extractor.py b/scripts/umap-extractor.py
index 5a8b19f..4c0a03c 100755
--- a/scripts/umap-extractor.py
+++ b/scripts/umap-extractor.py
@@ -30,7 +30,7 @@ config["tilelayer"] = properties["tilelayer"]
 config["tilelayer"]["attribution"] = re.sub(r'\[\[([^|]+)\|([^|]+)\]\]', r'<a href="\1" >\2</a>', config["tilelayer"]["attribution"])
 
 def normalize_name(name) :
-    return name.replace("/", "_").replace("-","").replace(" ","")
+    return name.replace("/", "_").replace("-","").replace(" ","").replace(".","")
 
 datadir = os.path.join(outdir,"data")
 if not os.path.exists(datadir) :