diff --git a/src/viewer.js b/src/viewer.js
index a1100bb1..7c3fd2d7 100644
--- a/src/viewer.js
+++ b/src/viewer.js
@@ -352,12 +352,12 @@ $.Viewer = function( options ) {
 
     if ( initialTileSource ) {
         this.open( initialTileSource );
+
+        if ( this.tileSources.length > 1 ) {
+            this._updateSequenceButtons( this.initialPage );
+        }
     }
-    
-    if ( this.tileSources.length > 1 ) {
-        this._updateSequenceButtons( this.initialPage );
-    }
-            
+
     for ( i = 0; i < this.customControls.length; i++ ) {
         this.addControl(
             this.customControls[ i ].id,