diff --git a/source/build/src/clip.cpp b/source/build/src/clip.cpp
index 925ed1070..9c40ba6e1 100644
--- a/source/build/src/clip.cpp
+++ b/source/build/src/clip.cpp
@@ -1344,7 +1344,7 @@ int32_t clipmove(vec3_t * const pos, int16_t * const sectnum, int32_t xvect, int
     {
         for (native_t i=clipnum-1;i>=0;--i)
         {
-            if (!bitmap_test(clipignore, i) && clipinsideboxline(pos->x, pos->y, clipit[i].x1, clipit[i].x2, clipit[i].y1, clipit[i].y2, walldist))
+            if (!bitmap_test(clipignore, i) && clipinsideboxline(pos->x, pos->y, clipit[i].x1, clipit[i].y1, clipit[i].x2, clipit[i].y2, walldist))
             {
                 vec2_t const vec = pos->vec2;
                 keepaway(&pos->x, &pos->y, i);