diff --git a/python/lsst/ip/diffim/modelPsfMatch.py b/python/lsst/ip/diffim/modelPsfMatch.py
index e126e561d..18490fe8e 100644
--- a/python/lsst/ip/diffim/modelPsfMatch.py
+++ b/python/lsst/ip/diffim/modelPsfMatch.py
@@ -54,6 +54,7 @@ class WarpedPsfTransformTooBigError(pipeBase.AlgorithmError):
     """Raised when the transform of a WarpedPsf is too large to compute
     the FWHM of the PSF at a given position.
     """
+    @property
     def metadata(self) -> dict:
         return {}
 
@@ -64,6 +65,7 @@ def __init__(self, position):
         super().__init__(message)
         self.position = position
 
+    @property
     def metadata(self) -> dict:
         return {
             "position": self.position,