diff --git a/src/directive.js b/src/directive.js
index 45f46a9..b261206 100644
--- a/src/directive.js
+++ b/src/directive.js
@@ -155,7 +155,7 @@ export default {
     } else {
       var elementBottom = getElementTop(element) - getElementTop(scrollEventTarget) + element.offsetHeight + viewportScrollTop;
 
-      shouldTrigger = viewportBottom + distance >= elementBottom;
+      shouldTrigger = parseInt(viewportBottom + distance) >= parseInt(elementBottom);
     }
 
     if (shouldTrigger && this.expression) {