diff --git a/js/src/frontend/BytecodeEmitter.cpp b/js/src/frontend/BytecodeEmitter.cpp
index 33ff9144fae9..1d51666a99b4 100644
--- a/js/src/frontend/BytecodeEmitter.cpp
+++ b/js/src/frontend/BytecodeEmitter.cpp
@@ -119,7 +119,7 @@ class BytecodeEmitter::NestableControl : public Nestable<BytecodeEmitter::Nestab
 
     template <typename T>
     T& as() {
-        MOZ_ASSERT(is<T>());
+        MOZ_ASSERT(this->is<T>());
         return static_cast<T&>(*this);
     }
 };