diff --git a/mlir/lib/Transforms/Utils/GreedyPatternRewriteDriver.cpp b/mlir/lib/Transforms/Utils/GreedyPatternRewriteDriver.cpp
--- a/mlir/lib/Transforms/Utils/GreedyPatternRewriteDriver.cpp
+++ b/mlir/lib/Transforms/Utils/GreedyPatternRewriteDriver.cpp
@@ -165,6 +165,7 @@
       if (isOpTriviallyDead(op)) {
         notifyOperationRemoved(op);
         op->erase();
+        changed = true;
         continue;
       }
 
@@ -186,7 +187,7 @@
 
       // Try to fold this op.
       if (succeeded(folder.tryToFold(op, collectOps, preReplaceAction))) {
-        changed |= true;
+        changed = true;
         continue;
       }