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
@@ -1129,7 +1129,7 @@
     if (payload.getOperands().back() != body->getArgument(0))
       return nullptr;
     // check rest
-    for (int i = 1; i < body->getNumArguments(); ++i) {
+    for (size_t i = 1; i < body->getNumArguments(); ++i) {
       if (payload.getOperand(i - 1) != body->getArgument(i)) {
         return nullptr;
       }