diff --git a/extras/tests/ResourceManager/StringBuilder.cpp b/extras/tests/ResourceManager/StringBuilder.cpp
index b649afeb..f8398587 100644
--- a/extras/tests/ResourceManager/StringBuilder.cpp
+++ b/extras/tests/ResourceManager/StringBuilder.cpp
@@ -3,6 +3,7 @@
 // MIT License
 
 #include <ArduinoJson/Memory/StringBuilder.hpp>
+#include <ArduinoJson/Memory/VariantPoolImpl.hpp>
 #include <catch.hpp>
 
 #include "Allocators.hpp"
diff --git a/extras/tests/ResourceManager/saveString.cpp b/extras/tests/ResourceManager/saveString.cpp
index 88c242f6..f19ac197 100644
--- a/extras/tests/ResourceManager/saveString.cpp
+++ b/extras/tests/ResourceManager/saveString.cpp
@@ -3,6 +3,7 @@
 // MIT License
 
 #include <ArduinoJson/Memory/ResourceManager.hpp>
+#include <ArduinoJson/Memory/VariantPoolImpl.hpp>
 #include <ArduinoJson/Strings/StringAdapters.hpp>
 #include <catch.hpp>