diff --git a/src/alock.c b/src/alock.c
index 31299db..409b3f7 100644
--- a/src/alock.c
+++ b/src/alock.c
@@ -174,8 +174,8 @@ static void initXInfo(struct aXInfo* xi) {
         xi->root = (Window*)calloc((size_t)xi->nr_screens, sizeof(Window));
         xi->colormap = (Colormap*)calloc((size_t)xi->nr_screens, sizeof(Colormap));
         xi->cursor = (Cursor*)calloc((size_t)xi->nr_screens, sizeof(Cursor));
-        xi->width_of_root = calloc(xi->nr_screens, sizeof(int));
-        xi->height_of_root = calloc(xi->nr_screens, sizeof(int));
+        xi->width_of_root = (int*)calloc(xi->nr_screens, sizeof(int));
+        xi->height_of_root = (int*)calloc(xi->nr_screens, sizeof(int));
     }
     {
         XWindowAttributes xgwa;
@@ -314,6 +314,11 @@ static int eventLoop(struct aOpts* opts, struct aXInfo* xi) {
                     break;
                 }
                 break;
+            case Expose: {
+                    XExposeEvent* eev = (XExposeEvent*)&ev;
+                    XClearWindow(xi->display, eev->window);
+                }
+                break;
             default:
                 break;
             }