diff --git a/mlir/lib/Transforms/Utils/DialectConversion.cpp b/mlir/lib/Transforms/Utils/DialectConversion.cpp
--- a/mlir/lib/Transforms/Utils/DialectConversion.cpp
+++ b/mlir/lib/Transforms/Utils/DialectConversion.cpp
@@ -364,11 +364,6 @@
       // If the argument is still used, replace it with the generated cast.
       if (!origArg.use_empty())
         origArg.replaceAllUsesWith(mapping.lookupOrDefault(castValue));
-
-      // If all users of the cast were removed, we can drop it. Otherwise, keep
-      // the operation alive and let the user handle any remaining usages.
-      if (castValue.use_empty() && castValue.getDefiningOp())
-        castValue.getDefiningOp()->erase();
     }
   }
 }