diff --git a/src/msw/dc.cpp b/src/msw/dc.cpp
index c950b2b90b..3a048895bf 100644
--- a/src/msw/dc.cpp
+++ b/src/msw/dc.cpp
@@ -404,6 +404,9 @@ private:
     wxDECLARE_NO_COPY_CLASS(wxBrushAttrsSetter);
 };
 
+namespace
+{
+
 // this class sets the stretch blit mode to COLORONCOLOR during its lifetime
 class StretchBltModeChanger
 {
@@ -434,6 +437,8 @@ private:
     wxDECLARE_NO_COPY_CLASS(StretchBltModeChanger);
 };
 
+} // anonymous namespace
+
 // ===========================================================================
 // implementation
 // ===========================================================================