diff --git a/extra/slides/slides.factor b/extra/slides/slides.factor
index 8b02fbdc47..8e90d9132e 100644
--- a/extra/slides/slides.factor
+++ b/extra/slides/slides.factor
@@ -104,7 +104,7 @@ SYNTAX: STRIP-TEASE:
     { T{ button-down } [ request-focus ] }
     { T{ key-down f f "DOWN" } [ next-page ] }
     { T{ key-down f f "UP" } [ prev-page ] }
-    { T{ key-down f f "f" } [ dup fullscreen? not set-fullscreen ] }
+    { T{ key-down f f "f" } [ toggle-fullscreen ] }
 } set-gestures
 
 : slides-window ( slides -- )