diff --git a/mlir/include/mlir/Analysis/DataFlow/ConstantPropagationAnalysis.h b/mlir/include/mlir/Analysis/DataFlow/ConstantPropagationAnalysis.h
--- a/mlir/include/mlir/Analysis/DataFlow/ConstantPropagationAnalysis.h
+++ b/mlir/include/mlir/Analysis/DataFlow/ConstantPropagationAnalysis.h
@@ -40,7 +40,7 @@
 
   /// Compare the constant values.
   bool operator==(const ConstantValue &rhs) const {
-    return constant == rhs.constant;
+    return constant == rhs.constant && dialect == rhs.dialect;
   }
 
   /// Print the constant value.