diff --git a/qfieldsync/core/layer.py b/qfieldsync/core/layer.py
index 1d2e4bbd..4b4e3cea 100644
--- a/qfieldsync/core/layer.py
+++ b/qfieldsync/core/layer.py
@@ -153,7 +153,7 @@ def is_supported(self):
 
     @property
     def warning(self):
-        if self.layer.source().endswith('jp2', 'jpx'):
+        if self.layer.source().endswith(('jp2', 'jpx')):
             return QCoreApplication.translate('DataSourceWarning',
                                               'JPEG2000 layers are not supported by QField.<br>You can rasterize '
                                               'them as basemap.'