diff --git a/mlir/lib/Dialect/Linalg/IR/LinalgOps.cpp b/mlir/lib/Dialect/Linalg/IR/LinalgOps.cpp
--- a/mlir/lib/Dialect/Linalg/IR/LinalgOps.cpp
+++ b/mlir/lib/Dialect/Linalg/IR/LinalgOps.cpp
@@ -749,7 +749,8 @@
       rewriter.setInsertionPointToStart(body);
       for (const auto &en : llvm::enumerate(
                body->getArguments().take_front(indexedOp.getNumLoops()))) {
-        Value index = rewriter.create<IndexOp>(indexedOp.getLoc(), en.index());
+        Value index = rewriter.create<IndexOp>(
+            indexedOp.getLoc(), static_cast<uint64_t>(en.index()));
         bvm.map(en.value(), index);
       }
     }