diff --git a/src/osx/cocoa/nonownedwnd.mm b/src/osx/cocoa/nonownedwnd.mm
index 64a6b3b74f..b21d2d2e14 100644
--- a/src/osx/cocoa/nonownedwnd.mm
+++ b/src/osx/cocoa/nonownedwnd.mm
@@ -914,12 +914,7 @@ bool wxNonOwnedWindowCocoaImpl::SetTransparent(wxByte alpha)
 
 bool wxNonOwnedWindowCocoaImpl::SetBackgroundColour(const wxColour& col )
 {
-    // only set the native background color if the toplevel window's
-    // background is not supposed to be transparent, otherwise the
-    // transparency is lost
-    if( GetWXPeer()->GetBackgroundStyle() != wxBG_STYLE_TRANSPARENT &&
-       !(GetWXPeer()->GetWindowStyle() & wxFRAME_SHAPED) )
-        [m_macWindow setBackgroundColor:col.OSXGetNSColor()];
+    [m_macWindow setBackgroundColor:col.OSXGetNSColor()];
     return true;
 }
 
diff --git a/src/osx/nonownedwnd_osx.cpp b/src/osx/nonownedwnd_osx.cpp
index 3f46bca9e2..d43a4eba65 100644
--- a/src/osx/nonownedwnd_osx.cpp
+++ b/src/osx/nonownedwnd_osx.cpp
@@ -254,6 +254,13 @@ wxPoint wxNonOwnedWindow::GetClientAreaOrigin() const
 
 bool wxNonOwnedWindow::SetBackgroundColour(const wxColour& c )
 {
+    // only set the native background color if the toplevel window's
+    // background is not supposed to be transparent, otherwise the
+    // transparency is lost
+    if( GetBackgroundStyle() == wxBG_STYLE_TRANSPARENT ||
+       (GetWindowStyle() & wxFRAME_SHAPED) )
+        return false;
+
     if ( !wxWindow::SetBackgroundColour(c) && m_hasBgCol )
         return false ;