diff --git a/reactos/include/ndk/pstypes.h b/reactos/include/ndk/pstypes.h
index 14fc8d37914..34ccf5e2e8d 100644
--- a/reactos/include/ndk/pstypes.h
+++ b/reactos/include/ndk/pstypes.h
@@ -256,6 +256,7 @@ typedef struct _TEB
 #ifndef NTOS_MODE_USER
 
 #include "mmtypes.h"
+#include "obtypes.h"
 #include "extypes.h"
 #include "setypes.h"