diff --git a/brightray/browser/inspectable_web_contents_delegate.h b/brightray/browser/inspectable_web_contents_delegate.h
index 7ef79f60e0e3..0b2f3f6a2b2a 100644
--- a/brightray/browser/inspectable_web_contents_delegate.h
+++ b/brightray/browser/inspectable_web_contents_delegate.h
@@ -18,7 +18,8 @@ class InspectableWebContentsDelegate {
 
   // Called when the devtools is going to be showed, returning true to override
   // the default behavior.
-  virtual bool DevToolsShow(const std::string& side) { return false; }
+  // Receiver is given the chance to change the |dock_side|.
+  virtual bool DevToolsShow(std::string* dock_side) { return false; }
 };
 
 }  // namespace brightray
diff --git a/brightray/browser/inspectable_web_contents_impl.cc b/brightray/browser/inspectable_web_contents_impl.cc
index cf73a26443d0..c4a8f75ef4b5 100644
--- a/brightray/browser/inspectable_web_contents_impl.cc
+++ b/brightray/browser/inspectable_web_contents_impl.cc
@@ -94,7 +94,7 @@ void InspectableWebContentsImpl::ShowDevTools() {
         std::string());
   }
 
-  if (delegate_ && delegate_->DevToolsShow(dock_side_))
+  if (delegate_ && delegate_->DevToolsShow(&dock_side_))
     return;
 
   view_->SetDockSide(dock_side_);