diff --git a/mlir/lib/Pass/Pass.cpp b/mlir/lib/Pass/Pass.cpp
index 44b83c22fd515..a562a00eb1953 100644
--- a/mlir/lib/Pass/Pass.cpp
+++ b/mlir/lib/Pass/Pass.cpp
@@ -426,7 +426,7 @@ LogicalResult OpPassManager::initialize(MLIRContext *context,
 }
 
 llvm::hash_code OpPassManager::hash() {
-  llvm::hash_code hashCode;
+  llvm::hash_code hashCode{};
   for (Pass &pass : getPasses()) {
     // If this pass isn't an adaptor, directly hash it.
     auto *adaptor = dyn_cast<OpToOpPassAdaptor>(&pass);