diff --git a/src/resolveScrollableAncestorProp.js b/src/resolveScrollableAncestorProp.js
index fa343ab..c863bc0 100644
--- a/src/resolveScrollableAncestorProp.js
+++ b/src/resolveScrollableAncestorProp.js
@@ -3,7 +3,12 @@ export default function resolveScrollableAncestorProp(scrollableAncestor) {
   // To make Waypoint easier to work with, we allow this to be specified in
   // string form and safely convert to `window` here.
   if (scrollableAncestor === 'window') {
-    return global.window;
+    const globalWindow =
+    typeof window !== 'undefined' ? window :
+    typeof global !== 'undefined' && global.window ? global.window :
+    undefined;
+
+    return globalWindow;
   }
 
   return scrollableAncestor;