diff --git a/src/main.c b/src/main.c
index fc8ea89..ad1a079 100644
--- a/src/main.c
+++ b/src/main.c
@@ -63,8 +63,10 @@ int main(int argc, char **argv)
     for (int i = 0; i < ARROW_NUMBER; i++) {
         scheduler0->arrowList->space[i].x =
             rand() % scheduler0->globalDrawingSpace->xmax;
-        scheduler0->arrowList->space[i].y = rand() % SPACE_SIZE;
-        scheduler0->arrowList->space[i].z = rand() % SPACE_SIZE;
+        scheduler0->arrowList->space[i].y =
+            rand() % scheduler0->globalDrawingSpace->ymax;
+        scheduler0->arrowList->space[i].z =
+            rand() % scheduler0->globalDrawingSpace->zmax;
     }
 
     scheduler0->nmaxThread = MAX_THREAD;