1 files changed, 7 insertions, 5 deletions
diff --git a/game.scm b/game.scm
index a82136f..04c0a65 100644
--- a/game.scm
+++ b/game.scm
@@ -781,11 +781,13 @@
      (define (enemy-update! enemy)
        (match enemy
          (#('enemy _ _ position size stationary? velocity _ _ _ _ _ _)
-          (if stationary?
-              (set-vec2-y! position (+ (vec2-y position) (- *scroll* *last-scroll*)))
-              (begin
-                (set-vec2-x! position (+ (vec2-x position) (vec2-x velocity)))
-                (set-vec2-y! position (+ (vec2-y position) (vec2-y velocity))))))))
+          (let ((scroll-dy (- *scroll* *last-scroll*)))
+            (if stationary?
+                (set-vec2-y! position (+ (vec2-y position) scroll-dy))
+                (begin
+                  (set-vec2-x! position (+ (vec2-x position) (vec2-x velocity)))
+                  (set-vec2-y! position (+ (vec2-y position)
+                                           (+ (vec2-y velocity) scroll-dy)))))))))
      (define (draw-enemy enemy time)
        (let ((frame-duration 250.0))
          (match enemy