diff --git a/plugins/Cardinal/src/Ildaeil.cpp b/plugins/Cardinal/src/Ildaeil.cpp
index 1130aee..55a2b65 100644
--- a/plugins/Cardinal/src/Ildaeil.cpp
+++ b/plugins/Cardinal/src/Ildaeil.cpp
@@ -39,6 +39,7 @@
 # include "../../src/extra/SharedResourcePointer.hpp"
 #else
 # include "extra/Mutex.hpp"
+# include "extra/String.hpp"
 #endif
 
 #include "CarlaNativePlugin.h"