diff --git a/modules/nonfree/include/opencv2/nonfree/ocl.hpp b/modules/nonfree/include/opencv2/nonfree/ocl.hpp
index 5d9eb86b50..ba84d24436 100644
--- a/modules/nonfree/include/opencv2/nonfree/ocl.hpp
+++ b/modules/nonfree/include/opencv2/nonfree/ocl.hpp
@@ -53,7 +53,7 @@ namespace cv
         //! Speeded up robust features, port from GPU module.
         ////////////////////////////////// SURF //////////////////////////////////////////
 
-        class CV_EXPORTS SURF_OCL : public Feature2D
+        class CV_EXPORTS SURF_OCL : public cv::Feature2D
         {
         public:
             enum KeypointLayout