diff --git a/CHANGELOG.md b/CHANGELOG.md
index b570a29352..b6c87a37b3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,9 @@
 ### Improvements
 - Points with small radii or thin strokes are rendered better (#1021)
 
+### Bug Fixes
+- Mouse wheel events didn't recompute gcs coordinates, so a wheel event without a previous move event coult list the wrong location (#1027)
+
 ## Version 0.19.6
 
 ### Features
diff --git a/src/mapInteractor.js b/src/mapInteractor.js
index e791981a8d..42d81eb580 100644
--- a/src/mapInteractor.js
+++ b/src/mapInteractor.js
@@ -816,6 +816,9 @@ var mapInteractor = function (args) {
    * @param {jQuery.Event} evt JQuery event with the mouse position.
    */
   this._getMousePosition = function (evt) {
+    if (evt.pageX === undefined || evt.pageY === undefined) {
+      return;
+    }
     var offset = $node.offset(), dt, t;
 
     t = (new Date()).valueOf();
@@ -849,6 +852,9 @@ var mapInteractor = function (args) {
    * @param {jQuery.Event} evt The event that trigger the mouse action.
    */
   this._getMouseButton = function (evt) {
+    if (evt.buttons === undefined && evt.which === undefined) {
+      return;
+    }
     for (var prop in m_mouse.buttons) {
       if (m_mouse.buttons.hasOwnProperty(prop)) {
         m_mouse.buttons[prop] = false;
@@ -1725,6 +1731,8 @@ var mapInteractor = function (args) {
       }
 
       // perform the map navigation event
+      m_this._getMousePosition(evt);
+      m_this._getMouseButton(evt);
       m_this._getMouseModifiers(evt);
 
       actionRecord = actionMatch({wheel: true}, m_mouse.modifiers,