diff --git a/src/dzitilesource.js b/src/dzitilesource.js
index 7ca2a279..9410ee68 100644
--- a/src/dzitilesource.js
+++ b/src/dzitilesource.js
@@ -31,6 +31,7 @@
  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
+/* global processDZIError:true */
 
 (function( $ ){
 
diff --git a/src/fullscreen.js b/src/fullscreen.js
index bde5b78c..feeab0b5 100644
--- a/src/fullscreen.js
+++ b/src/fullscreen.js
@@ -121,6 +121,7 @@
         // Older IE.  Support based on:
         // http://stackoverflow.com/questions/1125084/how-to-make-in-javascript-full-screen-windows-stretching-all-over-the-screen/7525760
         fullScreenApi.requestFullScreen = function(){
+            /* global ActiveXObject:true */
             var wscript = new ActiveXObject("WScript.Shell");
             if ( wscript !== null ) {
                 wscript.SendKeys("{F11}");
diff --git a/src/openseadragon.js b/src/openseadragon.js
index b6d7b5f2..dbd22e27 100644
--- a/src/openseadragon.js
+++ b/src/openseadragon.js
@@ -1283,6 +1283,7 @@ window.OpenSeadragon = window.OpenSeadragon || function( options ){
                 request = new XMLHttpRequest();
             } else if ( window.ActiveXObject ) {
                 /*jshint loopfunc:true*/
+                /* global ActiveXObject:true */
                 for ( var i = 0; i < ACTIVEX.length; i++ ) {
                     try {
                         request = new ActiveXObject( ACTIVEX[ i ] );
@@ -1832,6 +1833,8 @@ window.OpenSeadragon = window.OpenSeadragon || function( options ){
      * @deprecated
      */
     function processDZI( imageNode, tilesUrl ) {
+        /* global imageFormatSupported:true */
+
         var fileFormat    = imageNode.getAttribute( "Format" ),
             sizeNode      = imageNode.getElementsByTagName( "Size" )[ 0 ],
             dispRectNodes = imageNode.getElementsByTagName( "DisplayRect" ),
@@ -1883,6 +1886,8 @@ window.OpenSeadragon = window.OpenSeadragon || function( options ){
      * @deprecated
      */
     function processDZIJSON( imageData, tilesUrl ) {
+        /* global imageFormatSupported:true */
+
         var fileFormat    = imageData.Format,
             sizeData      = imageData.Size,
             dispRectData  = imageData.DisplayRect || [],