diff --git a/modules/core/src/parallel.cpp b/modules/core/src/parallel.cpp
index ff1ce9bafc..81a16a8bd2 100644
--- a/modules/core/src/parallel.cpp
+++ b/modules/core/src/parallel.cpp
@@ -125,6 +125,8 @@
 #  define CV_PARALLEL_FRAMEWORK "pthreads"
 #endif
 
+using namespace cv;
+
 namespace cv
 {
     ParallelLoopBody::~ParallelLoopBody() {}