diff --git a/lib/darwin.js b/lib/darwin.js
index c0d94a3..74b26cf 100644
--- a/lib/darwin.js
+++ b/lib/darwin.js
@@ -1,6 +1,7 @@
 const AnimationFrameProvider = require('bare-animation-frame')
 const AppKitApplication = require('bare-app-kit/application')
 const AppKitEvent = require('bare-app-kit/event')
+const FoundationProcessInfo = require('bare-foundation/process-info')
 
 const { TYPE, MASK } = AppKitEvent
 
@@ -12,6 +13,7 @@ module.exports = class DarwinPointer {
   constructor() {
     this._window = null
     this._point = null
+    this._press = 0
   }
 
   size(view) {
@@ -50,6 +52,8 @@ module.exports = class DarwinPointer {
   }
 
   down(view, x, y) {
+    this._press++
+
     this._send(TYPE.LEFT_MOUSE_DOWN, view, x, y)
   }
 
@@ -65,8 +69,8 @@ module.exports = class DarwinPointer {
     const window = view.window
     const point = view.convertPointToView(x, y, null)
 
-    // Ahead of anything already queued that could take the window off key, as
-    // the first press in a window that is not key only makes it key.
+    this._press++
+
     AppKitApplication.postEvent(this._event(TYPE.LEFT_MOUSE_UP, window, point), true)
     AppKitApplication.postEvent(this._event(TYPE.LEFT_MOUSE_DOWN, window, point), true)
   }
@@ -96,6 +100,14 @@ module.exports = class DarwinPointer {
   }
 
   _event(type, window, point) {
-    return AppKitEvent.mouseEvent(type, point.x, point.y, 0, 0, window.windowNumber)
+    return AppKitEvent.mouseEvent(
+      type,
+      point.x,
+      point.y,
+      0,
+      FoundationProcessInfo.processInfo.systemUptime,
+      window.windowNumber,
+      this._press
+    )
   }
 }
diff --git a/package.json b/package.json
index 71ed91f..597e427 100644
--- a/package.json
+++ b/package.json
@@ -49,6 +49,7 @@
   "dependencies": {
     "bare-animation-frame": "^0.1.1",
     "bare-app-kit": "^0.3.3",
+    "bare-foundation": "^0.1.1",
     "bare-ndk": "^0.3.4",
     "bare-ui-kit-touch": "^0.1.0",
     "bare-user32": "^0.1.1",