diff --git a/devtools/client/netmonitor/test/browser_net_image-tooltip.js b/devtools/client/netmonitor/test/browser_net_image-tooltip.js
index d6db567909d0..1cb79c275dc1 100644
--- a/devtools/client/netmonitor/test/browser_net_image-tooltip.js
+++ b/devtools/client/netmonitor/test/browser_net_image-tooltip.js
@@ -50,7 +50,7 @@ add_task(function* test() {
 
   info("Checking if the image thumbnail is hidden when mouse leaves the menu widget");
   let requestsListContents = document.querySelector(".requests-list-contents");
-  EventUtils.synthesizeMouse(requestsListContents, 0, 0, { type: "mouseout" },
+  EventUtils.synthesizeMouse(requestsListContents, 0, 0, { type: "mousemove" },
                              monitor.panelWin);
   yield waitUntil(() => !toolboxDoc.querySelector(".tooltip-container.tooltip-visible"));
 
diff --git a/devtools/client/shared/test/browser_html_tooltip_hover.js b/devtools/client/shared/test/browser_html_tooltip_hover.js
index a1b8b87635ae..e762cba079c3 100644
--- a/devtools/client/shared/test/browser_html_tooltip_hover.js
+++ b/devtools/client/shared/test/browser_html_tooltip_hover.js
@@ -45,7 +45,7 @@ add_task(function* () {
 
   info("Move out of the container");
   let hidden = tooltip.once("hidden");
-  EventUtils.synthesizeMouseAtCenter(container, { type: "mouseout" }, doc.defaultView);
+  EventUtils.synthesizeMouseAtCenter(container, { type: "mousemove" }, doc.defaultView);
   yield hidden;
 
   info("Destroy the tooltip and finish");
diff --git a/devtools/client/shared/widgets/tooltip/TooltipToggle.js b/devtools/client/shared/widgets/tooltip/TooltipToggle.js
index b53664f34929..6e07bcd8b63c 100644
--- a/devtools/client/shared/widgets/tooltip/TooltipToggle.js
+++ b/devtools/client/shared/widgets/tooltip/TooltipToggle.js
@@ -154,7 +154,7 @@ TooltipToggle.prototype = {
 
   _onMouseOut: function (event) {
     // Only hide the tooltip if the mouse leaves baseNode.
-    if (event && this._baseNode && !this._baseNode.contains(event.relatedTarget)) {
+    if (event && this._baseNode && this._baseNode.contains(event.relatedTarget)) {
       return;
     }