diff --git a/sys/kern/link_elf.c b/sys/kern/link_elf.c
index 613d1e4e79ab..32f45ce3ef48 100644
--- a/sys/kern/link_elf.c
+++ b/sys/kern/link_elf.c
@@ -33,6 +33,7 @@
 #include <sys/kernel.h>
 #include <sys/lock.h>
 #include <sys/malloc.h>
+#include <sys/mutex.h>
 #include <sys/proc.h>
 #include <sys/namei.h>
 #include <sys/fcntl.h>
diff --git a/sys/kern/link_elf_obj.c b/sys/kern/link_elf_obj.c
index 613d1e4e79ab..32f45ce3ef48 100644
--- a/sys/kern/link_elf_obj.c
+++ b/sys/kern/link_elf_obj.c
@@ -33,6 +33,7 @@
 #include <sys/kernel.h>
 #include <sys/lock.h>
 #include <sys/malloc.h>
+#include <sys/mutex.h>
 #include <sys/proc.h>
 #include <sys/namei.h>
 #include <sys/fcntl.h>