diff --git a/ipc/testshell/TestShellParent.cpp b/ipc/testshell/TestShellParent.cpp
index f0c851101a66..867f16172e87 100644
--- a/ipc/testshell/TestShellParent.cpp
+++ b/ipc/testshell/TestShellParent.cpp
@@ -17,7 +17,6 @@ using namespace mozilla;
 using mozilla::ipc::TestShellParent;
 using mozilla::ipc::TestShellCommandParent;
 using mozilla::ipc::PTestShellCommandParent;
-using mozilla::dom::ContentParent;
 
 void
 TestShellParent::ActorDestroy(ActorDestroyReason aWhy)