diff --git a/src/pixmap.cxx b/src/pixmap.cxx
index 9c80361..d2ed5c0 100644
--- a/src/pixmap.cxx
+++ b/src/pixmap.cxx
@@ -990,9 +990,6 @@ CPixmap::FromDisplayToGame (Sint32 & x, Sint32 & y, double prevScale)
 void
 CPixmap::FromGameToDisplay (Sint32 & x, Sint32 & y)
 {
-  Sint32 w, h;
-  SDL_GetWindowSize (g_window, &w, &h);
-
   double factor = 1;
 
   if (!g_bFullScreen)
@@ -1004,6 +1001,9 @@ CPixmap::FromGameToDisplay (Sint32 & x, Sint32 & y)
   if (!g_bFullScreen)
     return;
 
+  Sint32 w, h;
+  SDL_GetWindowSize (g_window, &w, &h);
+
   double _w = w, _h = h;
 
   x = x * _w / LXIMAGE ();