diff -r 49c31d8cc740 -r df9d9d19406a hedgewars/uLandObjects.pas
--- a/hedgewars/uLandObjects.pas	Tue Oct 24 18:28:59 2017 -0400
+++ b/hedgewars/uLandObjects.pas	Tue Oct 24 18:55:19 2017 -0400
@@ -262,7 +262,7 @@
     girSurf:= LoadDataImageAltPath(ptCurrTheme, ptGraphics, 'Girder', ifCritical or ifColorKey or ifIgnoreCaps);
 
 for y := 0 to girsurf^.h-1 do
-    syncedPixelDigest:= Adler32Update(syncedPixelDigest, @PByteArray(girsurf^.pixels)^[y*girsurf^.pitch], girsurf^.w);
+    syncedPixelDigest:= Adler32Update(syncedPixelDigest, @PByteArray(girsurf^.pixels)^[y*girsurf^.pitch], girsurf^.w*4);
 
 girderHeight:= girSurf^.h;
 
@@ -699,7 +699,7 @@
             if (Maxcnt < 1) or (Maxcnt > MAXTHEMEOBJECTS) then
                 OutError('Object''s max count should be between 1 and '+ inttostr(MAXTHEMEOBJECTS) +' (it was '+ inttostr(Maxcnt) +').', true);
             for y := 0 to Surf^.h-1 do
-                syncedPixelDigest:= Adler32Update(syncedPixelDigest, @PByteArray(Surf^.pixels)^[y*Surf^.pitch], Surf^.w);
+                syncedPixelDigest:= Adler32Update(syncedPixelDigest, @PByteArray(Surf^.pixels)^[y*Surf^.pitch], Surf^.w*4);
 
             inrectcnt := 0;