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-rw-r--r--lisp/play/bubbles.el2
1 files changed, 1 insertions, 1 deletions
diff --git a/lisp/play/bubbles.el b/lisp/play/bubbles.el
index 91968b02bc8..69620aeaca2 100644
--- a/lisp/play/bubbles.el
+++ b/lisp/play/bubbles.el
@@ -1377,7 +1377,7 @@ Return t if new char is non-empty."
(g (nth 1 crgb))
(b (nth 2 crgb))
(brightness (/ (+ r g b) 3.0 256 256))
- (val (sin (* brightness (/ pi 2))))
+ (val (sin (* brightness (/ float-pi 2))))
(rr (* red val))
(gg (* green val))
(bb (* blue val))