diff --git a/mlir/lib/Dialect/SCF/IR/SCF.cpp b/mlir/lib/Dialect/SCF/IR/SCF.cpp
index c454f342b4204..4aab0608b47e0 100644
--- a/mlir/lib/Dialect/SCF/IR/SCF.cpp
+++ b/mlir/lib/Dialect/SCF/IR/SCF.cpp
@@ -3143,6 +3143,8 @@ struct ParallelOpSingleOrZeroIterationDimsFolder
 struct MergeNestedParallelLoops : public OpRewritePattern<ParallelOp> {
   using OpRewritePattern<ParallelOp>::OpRewritePattern;
 
+  void initialize() { setDebugName("MergeNestedParallelLoops"); }
+
   LogicalResult matchAndRewrite(ParallelOp op,
                                 PatternRewriter &rewriter) const override {
     Block &outerBody = *op.getBody();