diff --git a/src/tests/servers/app/look_and_feel/LookAndFeel.cpp b/src/tests/servers/app/look_and_feel/LookAndFeel.cpp
index 0f4d6dd50c..82485a659d 100644
--- a/src/tests/servers/app/look_and_feel/LookAndFeel.cpp
+++ b/src/tests/servers/app/look_and_feel/LookAndFeel.cpp
@@ -11,6 +11,7 @@
 #include <MenuField.h>
 #include <MenuItem.h>
 #include <PopUpMenu.h>
+#include <String.h>
 #include <Window.h>
 
 #include <stdio.h>