diff --git a/kernel/src/thread/ThreadImage.h b/kernel/src/thread/ThreadImage.h
index 49835fcd..e568a629 100644
--- a/kernel/src/thread/ThreadImage.h
+++ b/kernel/src/thread/ThreadImage.h
@@ -10,6 +10,7 @@
 #include <luna/OwnedPtr.h>
 #include <luna/Result.h>
 #include <luna/Stack.h>
+#include <luna/String.h>
 #include <luna/Vector.h>
 
 class Thread;