diff --git a/client/src/sass/player/peertube-skin.scss b/client/src/sass/player/peertube-skin.scss
index 17fd14342..7fe4ac193 100644
--- a/client/src/sass/player/peertube-skin.scss
+++ b/client/src/sass/player/peertube-skin.scss
@@ -12,8 +12,8 @@ body {
 @mixin big-play-button-triangle-size($triangle-size) {
   width: $triangle-size;
   height: $triangle-size;
-  top: calc(50% - math.div($triangle-size, 2));
-  left: calc(53% - math.div($triangle-size, 2));
+  top: calc(50% - #{math.div($triangle-size, 2)});
+  left: calc(53% - #{math.div($triangle-size, 2)});
 }
 
 .video-js.vjs-peertube-skin {