diff --git a/src/ResizeSensor.js b/src/ResizeSensor.js
index 753eb27..1058ec1 100755
--- a/src/ResizeSensor.js
+++ b/src/ResizeSensor.js
@@ -77,7 +77,7 @@
                 '</div>';
             element.appendChild(element.resizeSensor);
 
-            if ('absolute' !== getComputedStyle(element, 'position')) {
+            if (!{fixed: 1, absolute: 1}[getComputedStyle(element, 'position')]) {
                 element.style.position = 'relative';
             }