diff --git a/browser/native_window_mac.h b/browser/native_window_mac.h
index 6c485e79f7c4..ea359fa101b4 100644
--- a/browser/native_window_mac.h
+++ b/browser/native_window_mac.h
@@ -98,7 +98,7 @@ class NativeWindowMac : public NativeWindow {
 
   // Mouse location since the last mouse event, in screen coordinates. This is
   // used in custom drag to compute the window movement.
-  NSPoint last_mouse_location_;
+  NSPoint last_mouse_offset_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeWindowMac);
 };
diff --git a/browser/native_window_mac.mm b/browser/native_window_mac.mm
index e293074e34b9..d6858a191bb0 100644
--- a/browser/native_window_mac.mm
+++ b/browser/native_window_mac.mm
@@ -435,17 +435,18 @@ bool NativeWindowMac::IsWithinDraggableRegion(NSPoint point) const {
 }
 
 void NativeWindowMac::HandleMouseEvent(NSEvent* event) {
+  NSPoint current_mouse_location =
+      [window() convertBaseToScreen:[event locationInWindow]];
+
   if ([event type] == NSLeftMouseDown) {
-    last_mouse_location_ =
-        [window() convertBaseToScreen:[event locationInWindow]];
-  } else if ([event type] == NSLeftMouseDragged) {
-    NSPoint current_mouse_location =
-        [window() convertBaseToScreen:[event locationInWindow]];
     NSPoint frame_origin = [window() frame].origin;
-    frame_origin.x += current_mouse_location.x - last_mouse_location_.x;
-    frame_origin.y += current_mouse_location.y - last_mouse_location_.y;
-    [window() setFrameOrigin:frame_origin];
-    last_mouse_location_ = current_mouse_location;
+    last_mouse_offset_ = NSMakePoint(
+        frame_origin.x - current_mouse_location.x,
+        frame_origin.y - current_mouse_location.y);
+  } else if ([event type] == NSLeftMouseDragged) {
+    [window() setFrameOrigin:NSMakePoint(
+        current_mouse_location.x + last_mouse_offset_.x,
+        current_mouse_location.y + last_mouse_offset_.y)];
   }
 }