diff --git a/Source/core/css/resolver/ElementResolveContext.h b/Source/core/css/resolver/ElementResolveContext.h
index 04056fe..0b3996e 100644
--- a/Source/core/css/resolver/ElementResolveContext.h
+++ b/Source/core/css/resolver/ElementResolveContext.h
@@ -34,6 +34,7 @@
 
 // ElementResolveContext is immutable and serves as an input to the style resolve process.
 class ElementResolveContext {
+    STACK_ALLOCATED();
 public:
     ElementResolveContext()
         : m_element(0)