diff --git a/src/radeon_video.c b/src/radeon_video.c
index 56cd9ab..78c3a81 100644
--- a/src/radeon_video.c
+++ b/src/radeon_video.c
@@ -42,10 +42,15 @@ radeon_box_intersect(BoxPtr dest, BoxPtr a, BoxPtr b)
 {
     dest->x1 = a->x1 > b->x1 ? a->x1 : b->x1;
     dest->x2 = a->x2 < b->x2 ? a->x2 : b->x2;
+    if (dest->x1 >= dest->x2) {
+        dest->x1 = dest->x2 = dest->y1 = dest->y2 = 0;
+        return;
+    }
+
     dest->y1 = a->y1 > b->y1 ? a->y1 : b->y1;
     dest->y2 = a->y2 < b->y2 ? a->y2 : b->y2;
 
-    if (dest->x1 >= dest->x2 || dest->y1 >= dest->y2)
+    if (dest->y1 >= dest->y2)
 	dest->x1 = dest->x2 = dest->y1 = dest->y2 = 0;
 }