diff --git a/servers/slapd/back-passwd/back-passwd.h b/servers/slapd/back-passwd/back-passwd.h
new file mode 100644
index 0000000000..4f2b9080d6
--- /dev/null
+++ b/servers/slapd/back-passwd/back-passwd.h
@@ -0,0 +1,13 @@
+/* $OpenLDAP$ */
+#ifndef _BACK_PASSWD_H
+#define _BACK_PASSWD_H
+
+#include "external.h"
+
+LDAP_BEGIN_DECL
+
+extern ldap_pvt_thread_mutex_t passwd_mutex;
+
+LDAP_END_DECL
+
+#endif /* _BACK_PASSWD_H */