diff --git a/modules/juce_core/containers/juce_Variant.h b/modules/juce_core/containers/juce_Variant.h
index 7dd41b6625..d70e165706 100644
--- a/modules/juce_core/containers/juce_Variant.h
+++ b/modules/juce_core/containers/juce_Variant.h
@@ -51,7 +51,7 @@ public:
     /** This structure is passed to a NativeFunction callback, and contains invocation
         details about the function's arguments and context.
     */
-    struct NativeFunctionArgs
+    struct JUCE_API  NativeFunctionArgs
     {
         NativeFunctionArgs (const var& thisObject, const var* args, int numArgs) noexcept;
 
diff --git a/modules/juce_core/javascript/juce_Javascript.h b/modules/juce_core/javascript/juce_Javascript.h
index 13286c0fee..17fc2ba1a6 100644
--- a/modules/juce_core/javascript/juce_Javascript.h
+++ b/modules/juce_core/javascript/juce_Javascript.h
@@ -46,7 +46,7 @@
     script creates complex connections between objects, you run the risk of creating cyclic
     dependencies and hence leaking.
 */
-class JavascriptEngine
+class JUCE_API  JavascriptEngine
 {
 public:
     /** Creates an instance of the engine.