diff --git a/mlir/include/mlir/Dialect/Linalg/IR/LinalgInterfaces.td b/mlir/include/mlir/Dialect/Linalg/IR/LinalgInterfaces.td
--- a/mlir/include/mlir/Dialect/Linalg/IR/LinalgInterfaces.td
+++ b/mlir/include/mlir/Dialect/Linalg/IR/LinalgInterfaces.td
@@ -902,7 +902,7 @@
     Interface for decomposing aggregated operations into a sequence of simpler
     ops.
   }];
-  let cppNamespace = "::mlir";
+  let cppNamespace = "::mlir::linalg";
   let methods = [
       InterfaceMethod<
         /*desc=*/[{