diff --git a/src/ball.c b/src/ball.c
index fecfbb6..cf2af41 100644
--- a/src/ball.c
+++ b/src/ball.c
@@ -21,7 +21,10 @@ Ball_init(int screen_width, int screen_height)
 void
 Ball_reset(Ball *b, int direction) {
   // 120 deg angle with norm horizontal vector
-  const int angle = rand() % 60 + 60;
+  int angle;
+  do {
+    angle = rand() % 60 + 60;
+  } while (angle == 90);
   b->posX = b->SCREEN_WIDTH/2;
   b->posY = b->SCREEN_HEIGHT/2;
   b->velX = direction * b->BALL_VELOCITY * cos(angle * 2 * M_PI / 180);