diff --git a/modules/cudaarithm/test/test_arithm.cpp b/modules/cudaarithm/test/test_arithm.cpp
index 0ee4e346990bca77ac06ca4ffd8c0728462aad44..257f5233cc4182a58b456b8550000e01eace4744 100644
--- a/modules/cudaarithm/test/test_arithm.cpp
+++ b/modules/cudaarithm/test/test_arithm.cpp
@@ -46,6 +46,8 @@
 
 using namespace cvtest;
 
+namespace {
+
 //////////////////////////////////////////////////////////////////////////////
 // GEMM
 
@@ -401,4 +403,6 @@ INSTANTIATE_TEST_CASE_P(CUDA_Arithm, Convolve, testing::Combine(
 
 #endif // HAVE_CUBLAS
 
+} // namespace
+
 #endif // HAVE_CUDA