diff --git a/src/levels/modules/dodger/actions.c b/src/levels/modules/dodger/actions.c
index 3a89f77..5a1da5c 100644
--- a/src/levels/modules/dodger/actions.c
+++ b/src/levels/modules/dodger/actions.c
@@ -149,7 +149,8 @@ bool GenerateObstacles(struct Game *game, struct TM_Action *action, enum TM_Acti
 			} else {
 				obst->callback = &Obst_MoveUpDown;
 				obst->bitmap = &(game->level.dodger.obst_bmps.screwball);
-				obst->data = (void*)(rand()%2); // FIXME: not portable!
+				obst->data = malloc(sizeof(bool));
+				*((bool*)obst->data) = rand()%2;
 				obst->rows = 4;
 				obst->cols = 4;
 				obst->speed = 1.1;
diff --git a/src/levels/modules/dodger/callbacks.c b/src/levels/modules/dodger/callbacks.c
index d5c1bab..394cf48 100644
--- a/src/levels/modules/dodger/callbacks.c
+++ b/src/levels/modules/dodger/callbacks.c
@@ -23,15 +23,15 @@
 #include "callbacks.h"
 
 void Obst_MoveUpDown(struct Game *game, struct Obstacle *obstacle) {
-	if (obstacle->data) {
+	if (*((bool*)obstacle->data)) {
 		obstacle->y -= 0.5;
 		if (obstacle->y<=0) {
-			obstacle->data=NULL;
+			*((bool*)obstacle->data)=false;
 		}
 	} else {
 		obstacle->y += 0.5;
 		if (obstacle->y>=((game->viewportHeight-al_get_bitmap_height(*(obstacle->bitmap))/obstacle->rows)/(float)game->viewportHeight)*100) {
-			obstacle->data++;
+			*((bool*)obstacle->data)=true;
 		}
 	}
 }