diff --git a/modules/cvv/src/qtutil/filter/diffFilterWidget.cpp b/modules/cvv/src/qtutil/filter/diffFilterWidget.cpp
index a555c8498..70b971af9 100644
--- a/modules/cvv/src/qtutil/filter/diffFilterWidget.cpp
+++ b/modules/cvv/src/qtutil/filter/diffFilterWidget.cpp
@@ -14,6 +14,7 @@
 
 namespace cvv
 {
+using namespace cv;
 namespace qtutil
 {