diff --git a/lib/gingr/geoserver_publisher.rb b/lib/gingr/geoserver_publisher.rb
index 58af918..dbe7173 100644
--- a/lib/gingr/geoserver_publisher.rb
+++ b/lib/gingr/geoserver_publisher.rb
@@ -69,7 +69,7 @@ def batch_publish(filenames)
     def publish(filename)
       id = File.basename(filename, '.*')
       file_path = remote_filepath(id, filename)
-      if File.extname(filename).casecmp('.shp')
+      if File.extname(filename).casecmp('.shp').zero?
         publish_shapefile(file_path, id)
       else
         publish_geotiff(file_path, id)