diff --git a/src/core/user_script_controller_host.cpp b/src/core/user_script_controller_host.cpp
index 69284dbe16a389fe4dd54d161430af2f5e10e7e7..2f4a55c27d4a264e1dcf3897f4ac65bae93e4986 100644
--- a/src/core/user_script_controller_host.cpp
+++ b/src/core/user_script_controller_host.cpp
@@ -207,6 +207,8 @@ UserScriptControllerHost::UserScriptControllerHost()
 
 UserScriptControllerHost::~UserScriptControllerHost()
 {
+    Q_FOREACH (content::RenderProcessHost *renderer, m_observedProcesses)
+        renderer->RemoveObserver(m_renderProcessObserver.data());
 }
 
 } // namespace