diff --git a/src/rect.c b/src/rect.c
index 801af1343..1fb0f2b82 100644
--- a/src/rect.c
+++ b/src/rect.c
@@ -46,6 +46,7 @@ free_rect(void)
 {
     if (rect)
         free(rect);
+    rect = 0;
     n_rects = rect_cnt = 0;
 }