diff --git a/mlir/include/mlir/Parser/Parser.h b/mlir/include/mlir/Parser/Parser.h
--- a/mlir/include/mlir/Parser/Parser.h
+++ b/mlir/include/mlir/Parser/Parser.h
@@ -49,6 +49,7 @@
   // If not, then build a new top-level op if a concrete operation type was
   // specified.
   if constexpr (std::is_same_v<ContainerOpT, Operation *>) {
+    (void)context;
     return emitError(sourceFileLoc)
                << "source must contain a single top-level operation, found: "
                << parsedBlock->getOperations().size(),