diff --git a/sys/fs/fifofs/fifo_vnops.c b/sys/fs/fifofs/fifo_vnops.c
index 8f915ec0c37..4cc83bd73e8 100644
--- a/sys/fs/fifofs/fifo_vnops.c
+++ b/sys/fs/fifofs/fifo_vnops.c
@@ -40,6 +40,7 @@
 #include <sys/time.h>
 #include <sys/namei.h>
 #include <sys/unistd.h>
+#include <sys/kernel.h>
 #include <sys/vnode.h>
 #include <sys/socket.h>
 #include <sys/socketvar.h>
diff --git a/sys/miscfs/fifofs/fifo_vnops.c b/sys/miscfs/fifofs/fifo_vnops.c
index 8f915ec0c37..4cc83bd73e8 100644
--- a/sys/miscfs/fifofs/fifo_vnops.c
+++ b/sys/miscfs/fifofs/fifo_vnops.c
@@ -40,6 +40,7 @@
 #include <sys/time.h>
 #include <sys/namei.h>
 #include <sys/unistd.h>
+#include <sys/kernel.h>
 #include <sys/vnode.h>
 #include <sys/socket.h>
 #include <sys/socketvar.h>