diff --git a/theatre/studio/src/uiComponents/useKeyDownCallback.tsx b/theatre/studio/src/uiComponents/useKeyDownCallback.tsx
index 0fd4bb7..b29a892 100644
--- a/theatre/studio/src/uiComponents/useKeyDownCallback.tsx
+++ b/theatre/studio/src/uiComponents/useKeyDownCallback.tsx
@@ -4,7 +4,7 @@ type AcceptableCombo = 'Shift' | 'Meta' | 'Control' | 'Alt'
 
 export default function useKeyDownCallback(
   combo: AcceptableCombo,
-  listener: (opts: {down: boolean; event: KeyboardEvent}) => void,
+  listener: (opts: {down: boolean; event: KeyboardEvent | undefined}) => void,
 ) {
   const refs = useRef({combo, listener})
   refs.current = {combo, listener}
@@ -21,11 +21,17 @@ export default function useKeyDownCallback(
       }
     }
 
+    function onBlur(event: unknown) {
+      refs.current.listener({down: false, event: undefined})
+    }
+
     document.addEventListener('keydown', onKeyDown)
     document.addEventListener('keyup', onKeyUp)
+    window.addEventListener('blur', onBlur)
     return () => {
       document.removeEventListener('keydown', onKeyDown)
       document.removeEventListener('keyup', onKeyUp)
+      window.removeEventListener('blur', onBlur)
     }
   }, [])
 }