diff --git a/pytato/equality.py b/pytato/equality.py
index 79d038d72..8f58153f1 100644
--- a/pytato/equality.py
+++ b/pytato/equality.py
@@ -135,7 +135,10 @@ def map_size_param(self, expr1: SizeParam, expr2: Any) -> bool:
                 )
 
     def map_data_wrapper(self, expr1: DataWrapper, expr2: Any) -> bool:
-        return expr1 is expr2
+        import numpy as np
+        return (expr1.__class__ is expr2.__class__
+                and np.array_equal(expr1.data.get(), expr2.data.get())
+        )
 
     def map_index_lambda(self, expr1: IndexLambda, expr2: Any) -> bool:
         return (expr1.__class__ is expr2.__class__