diff --git a/src/directives/observe-visibility.js b/src/directives/observe-visibility.js
index 1992846..a2cb8e1 100644
--- a/src/directives/observe-visibility.js
+++ b/src/directives/observe-visibility.js
@@ -9,7 +9,7 @@ class VisibilityState {
 	}
 
 	get threshold () {
-		return (this.options.intersection && this.options.intersection.threshold) || 0
+		return this.options.intersection && typeof this.options.intersection.threshold === 'number' ? this.options.intersection.threshold : 0
 	}
 
 	createObserver (options, vnode) {