--- a/build/clang-plugin/tests/TestCustomHeap.cpp
+++ b/build/clang-plugin/tests/TestCustomHeap.cpp
@@ -16,13 +16,12 @@ void *operator new(size_t x, int qual) M
 }
 
 template <typename T>
 T *customAlloc() MOZ_HEAP_ALLOCATOR {
   T *arg =  static_cast<T*>(malloc(sizeof(T)));
   return new (arg) T();
 }
 
-template <typename T>
-void misuseX(T q) {
+void misuseX() {
   X *foo = customAlloc<X>(); // expected-error {{variable of type 'X' is not valid on the heap}} expected-note {{value incorrectly allocated on the heap}}
   X *foo2 = new (100) X(); // expected-error {{variable of type 'X' is not valid on the heap}} expected-note {{value incorrectly allocated on the heap}}
 }