diff --git a/sys/fs/pseudofs/pseudofs_fileno.c b/sys/fs/pseudofs/pseudofs_fileno.c
index fa23edfbc83..24bfdbfcb1a 100644
--- a/sys/fs/pseudofs/pseudofs_fileno.c
+++ b/sys/fs/pseudofs/pseudofs_fileno.c
@@ -31,6 +31,7 @@
 #include <sys/param.h>
 #include <sys/kernel.h>
 #include <sys/systm.h>
+#include <sys/lock.h>
 #include <sys/malloc.h>
 #include <sys/mount.h>
 #include <sys/mutex.h>
diff --git a/sys/fs/pseudofs/pseudofs_vncache.c b/sys/fs/pseudofs/pseudofs_vncache.c
index f222f642ad9..465bfcd8a33 100644
--- a/sys/fs/pseudofs/pseudofs_vncache.c
+++ b/sys/fs/pseudofs/pseudofs_vncache.c
@@ -31,6 +31,7 @@
 #include <sys/param.h>
 #include <sys/kernel.h>
 #include <sys/systm.h>
+#include <sys/lock.h>
 #include <sys/malloc.h>
 #include <sys/mount.h>
 #include <sys/mutex.h>
diff --git a/sys/fs/pseudofs/pseudofs_vnops.c b/sys/fs/pseudofs/pseudofs_vnops.c
index f3170251beb..eb08e1df2fc 100644
--- a/sys/fs/pseudofs/pseudofs_vnops.c
+++ b/sys/fs/pseudofs/pseudofs_vnops.c
@@ -33,6 +33,7 @@
 #include <sys/systm.h>
 #include <sys/ctype.h>
 #include <sys/dirent.h>
+#include <sys/lock.h>
 #include <sys/mount.h>
 #include <sys/mutex.h>
 #include <sys/namei.h>