diff --git a/geoviews/operation/projection.py b/geoviews/operation/projection.py
index c24d91df..7b65ab91 100644
--- a/geoviews/operation/projection.py
+++ b/geoviews/operation/projection.py
@@ -251,7 +251,7 @@ def _process_element(self, element):
         new_data[mdim.name] = mag[mask]
 
         if len(new_data[xdim.name]) == 0:
-            self.warning('While projecting a {} element from a {} coordinate '
+            self.param.warning('While projecting a {} element from a {} coordinate '
                          'reference system (crs) to a {} projection none of '
                          'the projected paths were contained within the bounds '
                          'specified by the projection. Ensure you have specified '