diff --git a/hurd/hurdinline.c b/hurd/hurdinline.c
index 5d85c9e4f0..ed55ed6300 100644
--- a/hurd/hurdinline.c
+++ b/hurd/hurdinline.c
@@ -5,6 +5,7 @@
 #undef _EXTERN_INLINE
 #define _EXTERN_INLINE /* Define the real function. */
 
+#include "hurd.h"
 #include "hurd/fd.h"
 #include "hurd/signal.h"
 #include "hurd/userlink.h"