diff --git a/js/src/jsproxy.h b/js/src/jsproxy.h
index ec26e3a81634..aa0e7827e039 100644
--- a/js/src/jsproxy.h
+++ b/js/src/jsproxy.h
@@ -13,7 +13,7 @@
 
 namespace js {
 
-class Wrapper;
+class JS_FRIEND_API(Wrapper);
 
 /*
  * A proxy is a JSObject that implements generic behavior by providing custom
diff --git a/js/src/jsprvtd.h b/js/src/jsprvtd.h
index 19b5aef3c2ba..93e12163ec52 100644
--- a/js/src/jsprvtd.h
+++ b/js/src/jsprvtd.h
@@ -146,9 +146,9 @@ struct TreeContext;
 class UpvarCookie;
 
 class Proxy;
-class BaseProxyHandler;
-class DirectWrapper;
-class CrossCompartmentWrapper;
+class JS_FRIEND_API(BaseProxyHandler);
+class JS_FRIEND_API(DirectWrapper);
+class JS_FRIEND_API(CrossCompartmentWrapper);
 
 class TempAllocPolicy;
 class RuntimeAllocPolicy;