diff --git a/Kernel/ThreadTracer.h b/Kernel/ThreadTracer.h
index a407f62d67..589e0a7d27 100644
--- a/Kernel/ThreadTracer.h
+++ b/Kernel/ThreadTracer.h
@@ -8,6 +8,7 @@
 
 #include <AK/Optional.h>
 #include <AK/OwnPtr.h>
+#include <Kernel/Arch/RegisterState.h>
 #include <Kernel/Forward.h>
 #include <LibC/sys/arch/i386/regs.h>
 
diff --git a/Kernel/WorkQueue.h b/Kernel/WorkQueue.h
index 9f84424888..3337a1a290 100644
--- a/Kernel/WorkQueue.h
+++ b/Kernel/WorkQueue.h
@@ -10,6 +10,7 @@
 #include <AK/IntrusiveList.h>
 #include <Kernel/Forward.h>
 #include <Kernel/Locking/SpinlockProtected.h>
+#include <Kernel/WaitQueue.h>
 
 namespace Kernel {