diff --git a/dlls/ddraw/dsurface/main.c b/dlls/ddraw/dsurface/main.c
index e1cd11aefa9..edeec91a16d 100644
--- a/dlls/ddraw/dsurface/main.c
+++ b/dlls/ddraw/dsurface/main.c
@@ -281,9 +281,6 @@ HRESULT WINAPI IDirectDrawSurface4Impl_Blt(
 	yinc = (srcheight << 16) / dstheight;
 
 	if (!dwFlags) {
-	    assert(ddesc.lPitch >= width);
-	    assert(sdesc.lPitch >= width);
-
 	    /* No effects, we can cheat here */
 	    if (dstwidth == srcwidth) {
 		if (dstheight == srcheight) {
@@ -309,8 +306,6 @@ HRESULT WINAPI IDirectDrawSurface4Impl_Blt(
 		for (y = sy = 0; y < dstheight; y++, sy += yinc) {
 		    sbuf = sbase + (sy >> 16) * sdesc.lPitch;
 
-		    assert((sy>>16) < srcheight);
-
 		    if ((sy >> 16) == (last_sy >> 16)) {
 			/* this sourcerow is the same as last sourcerow -
 			 * copy already stretched row