diff --git a/src/types/flow.ts b/src/types/flow.ts
index abb1db41..a8c4f8ee 100644
--- a/src/types/flow.ts
+++ b/src/types/flow.ts
@@ -97,7 +97,7 @@ export interface FlowProps<N = any, E = N> {
   deleteKeyCode?: KeyCode
   selectionKeyCode?: KeyCode
   multiSelectionKeyCode?: KeyCode
-  zoomActivationKeyCode?: KeyCode | null
+  zoomActivationKeyCode?: KeyCode
   snapToGrid?: boolean
   snapGrid?: SnapGrid
   onlyRenderVisibleElements?: boolean