diff --git a/src/App/ObjectIdentifier.h b/src/App/ObjectIdentifier.h
index 5c207e0c0874..ca510482ef1f 100644
--- a/src/App/ObjectIdentifier.h
+++ b/src/App/ObjectIdentifier.h
@@ -267,7 +267,7 @@ class AppExport ObjectIdentifier {
 
 };
 
-std::size_t hash_value(const App::ObjectIdentifier & path);
+std::size_t AppExport hash_value(const App::ObjectIdentifier & path);
 
 }