Index: SDL_rotozoom.c
===================================================================
--- SDL_rotozoom.c
+++ SDL_rotozoom.c
@@ -227,7 +227,7 @@
     dp = (tColorRGBA *) dst->pixels;
 
     if (flipx) csp += (src->w-1);
-    if (flipy) csp += (src->pitch*(src->h-1));
+    if (flipy) csp += ((src->pitch/sizeof(tColorRGBA))*(src->h-1));
 
     csx = 0;
     csax = sax;