diff --git a/ChangeLog b/ChangeLog
index a8e2c27c1f..05a946d4b3 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -2,6 +2,7 @@
 
 	* sysdeps/mach/hurd/enbl-secure.c (__libc_init_secure): Define
 	function.
+	* sysdeps/posix/shm_open.c: Include <pthread.h>.
 
 2017-08-02  Joseph Myers  <joseph@codesourcery.com>
 
diff --git a/sysdeps/posix/shm_open.c b/sysdeps/posix/shm_open.c
index 64315de8f8..eeb6cb5589 100644
--- a/sysdeps/posix/shm_open.c
+++ b/sysdeps/posix/shm_open.c
@@ -25,6 +25,7 @@
 #else
 
 # include <fcntl.h>
+# include <pthread.h>
 # include <shm-directory.h>