diff --git a/src/mouse.c b/src/mouse.c
index a862f82..07cc1cc 100644
--- a/src/mouse.c
+++ b/src/mouse.c
@@ -98,7 +98,7 @@ void
 mouse_move(struct client *c, bool type)
 {
      struct client *c2 = NULL, *last = c;
-     struct tag *t;
+     struct tag *t = NULL;
      XEvent ev;
      Window w;
      int d, u;