diff --git a/win32ss/gdi/ntgdi/region.c b/win32ss/gdi/ntgdi/region.c
index 1456602852..9407858908 100644
--- a/win32ss/gdi/ntgdi/region.c
+++ b/win32ss/gdi/ntgdi/region.c
@@ -2149,9 +2149,9 @@ REGION_bXformRgn(
             /* Loop all rects in the region */
             for (i = 0; i < prgn->rdh.nCount - 1; i++)
             {
-                for (j = i; i < prgn->rdh.nCount; i++)
+                for (j = i; j < prgn->rdh.nCount; j++)
                 {
-                    NT_ASSERT(prgn->Buffer[i].top < prgn->Buffer[i].bottom);
+                    NT_ASSERT(prgn->Buffer[i].top <= prgn->Buffer[i].bottom);
                     NT_ASSERT(prgn->Buffer[j].top >= prgn->Buffer[i].top);
                 }
             }