diff --git a/js/src/table/gis_visualization.js b/js/src/table/gis_visualization.js
index af2054c242..9f70038f47 100644
--- a/js/src/table/gis_visualization.js
+++ b/js/src/table/gis_visualization.js
@@ -171,7 +171,7 @@ function onGisMouseWheel (event) {
     event.preventDefault();
 
     var relCoords = getRelativeCoords(event);
-    var factor = event.deltaY > 0 ? zoomFactor : 1 / zoomFactor;
+    var factor = event.deltaY > 0 ? 1 / zoomFactor : zoomFactor;
     // zoom
     scale *= factor;
     // zooming keeping the position under mouse pointer unmoved.