diff --git a/src/viewer.js b/src/viewer.js
index 57b16e4f..ba3c1e2a 100644
--- a/src/viewer.js
+++ b/src/viewer.js
@@ -2373,7 +2373,8 @@ function getTileSourceImplementation( viewer, tileSource, imgOptions, successCal
                 crossOriginPolicy: imgOptions.crossOriginPolicy !== undefined ?
                     imgOptions.crossOriginPolicy : viewer.crossOriginPolicy,
                 ajaxWithCredentials: viewer.ajaxWithCredentials,
-                ajaxHeaders: viewer.ajaxHeaders,
+                ajaxHeaders: imgOptions.ajaxHeaders ?
+                    imgOptions.ajaxHeaders : viewer.ajaxHeaders,
                 useCanvas: viewer.useCanvas,
                 success: function( event ) {
                     successCallback( event.tileSource );