diff --git a/ext/posix/config.m4 b/ext/posix/config.m4
index aa24907bc8d..9bd6fdb5c5b 100644
--- a/ext/posix/config.m4
+++ b/ext/posix/config.m4
@@ -9,5 +9,7 @@ if test "$PHP_POSIX" = "yes"; then
   AC_DEFINE(HAVE_POSIX, 1, [whether to include POSIX-like functions])
   PHP_NEW_EXTENSION(posix, posix.c, $ext_shared)
 
+  AC_CHECK_HEADERS(sys/mkdev.h)
+
   AC_CHECK_FUNCS(seteuid setegid setsid getsid setpgid getpgid ctermid mkfifo mknod getrlimit getlogin getgroups)
 fi
diff --git a/ext/posix/posix.c b/ext/posix/posix.c
index 7bee3d22e22..9558f0bb49c 100644
--- a/ext/posix/posix.c
+++ b/ext/posix/posix.c
@@ -44,6 +44,9 @@
 #include <errno.h>
 #include <grp.h>
 #include <pwd.h>
+#if HAVE_SYS_MKDEV_H
+# include <sys/mkdev.h>
+#endif
 
 ZEND_DECLARE_MODULE_GLOBALS(posix)