diff --git a/tests/graphics/clippingbox.cpp b/tests/graphics/clippingbox.cpp
index 9cf1071cca..832105609b 100644
--- a/tests/graphics/clippingbox.cpp
+++ b/tests/graphics/clippingbox.cpp
@@ -646,33 +646,32 @@ void ClippingBoxTestCaseBase::CheckClipRect(int x, int y, int width, int height)
         for( int py = ymin; py <= ymax; py++ )
             for( int px = xmin; px <= xmax; px++ )
             {
-                wxColour c;
                 unsigned char r = img.GetRed(px, py);
                 unsigned char g = img.GetGreen(px, py);
                 unsigned char b = img.GetBlue(px, py);
-                c.Set(r, g, b);
+                const wxColour col(r, g, b);
 
                 wxString msgColour;
                 if ( px >= x && px <= x + (width-1) &&
                      py >= y && py <= y + (height-1) )
                 {
                     // Pixel inside the box.
-                    if ( c != s_fgColour )
+                    if ( col != s_fgColour )
                     {
                         msgColour =
                             wxString::Format(wxS("Invalid colour drawn at (%i, %i): Actual: %s  Expected: %s"),
-                                    px, py, c.GetAsString().mbc_str(), s_fgColour.GetAsString().mbc_str());
+                                    px, py, col.GetAsString().mbc_str(), s_fgColour.GetAsString().mbc_str());
 
                     }
                 }
                 else
                 {
                     // Pixel outside the box.
-                    if ( c != s_bgColour )
+                    if ( col != s_bgColour )
                     {
                         msgColour =
                             wxString::Format(wxS("Invalid colour drawn at (%i, %i): Actual: %s  Expected: %s"),
-                                    px, py, c.GetAsString().mbc_str(), s_bgColour.GetAsString().mbc_str());
+                                    px, py, col.GetAsString().mbc_str(), s_bgColour.GetAsString().mbc_str());
                     }
                 }