diff --git a/modules/ocl/perf/perf_bgfg.cpp b/modules/ocl/perf/perf_bgfg.cpp
index d507a3b5e5..5bf406daf5 100644
--- a/modules/ocl/perf/perf_bgfg.cpp
+++ b/modules/ocl/perf/perf_bgfg.cpp
@@ -43,6 +43,7 @@
 //
 //M*/
 #include "perf_precomp.hpp"
+using namespace perf;
 using namespace cv;
 using namespace cv::ocl;