diff --git a/armi/reactor/converters/geometryConverters.py b/armi/reactor/converters/geometryConverters.py
index 94c052df7..64d62d6cc 100644
--- a/armi/reactor/converters/geometryConverters.py
+++ b/armi/reactor/converters/geometryConverters.py
@@ -1360,7 +1360,7 @@ def convert(self, r):
                         self.listOfVolIntegratedParamsToScale,
                         _,
                     ) = _generateListOfParamsToScale(
-                        self._sourceReactor, paramsToScaleSubset=[]
+                        self._sourceReactor.core, paramsToScaleSubset=[]
                     )
 
                 for b in a: