diff --git a/grudge/symbolic/operators.py b/grudge/symbolic/operators.py
index 8d92af5754622705f3cd18c7fbc71db062e6adf7..52dc963c10eeb14c309b0d80e0b2ab9a2f4a5569 100644
--- a/grudge/symbolic/operators.py
+++ b/grudge/symbolic/operators.py
@@ -185,7 +185,7 @@ class InterpolationOperator(ProjectionOperator):
 def interp(dd_in, dd_out):
     from warnings import warn
     warn("using 'interp' is deprecated, use 'project' instead.",
-            DeprecationWarning, stacklevel=1)
+            DeprecationWarning, stacklevel=2)
 
     return ProjectionOperator(dd_in, dd_out)