diff --git a/src/gtk/bitmap.cpp b/src/gtk/bitmap.cpp
index 69dd07e428..36dd9a1432 100644
--- a/src/gtk/bitmap.cpp
+++ b/src/gtk/bitmap.cpp
@@ -444,7 +444,7 @@ wxBitmap wxBitmap::Rescale( int clipx, int clipy, int clipwidth, int clipheight,
 
                 if ( dst )
                 {
-                    if (pixval)
+                    if (!pixval)
                     {
                         char bit=1;
                         char shift = bit << (w % 8);