--- a/ports/sysdeps/unix/sysv/linux/hppa/bits/socket_type.h
+++ b/ports/sysdeps/unix/sysv/linux/hppa/bits/socket_type.h
@@ -49,6 +49,7 @@
   SOCK_CLOEXEC = 010000000,	/* Atomically set close-on-exec flag for the
 				   new descriptor(s).  */
 #define SOCK_CLOEXEC SOCK_CLOEXEC
+#undef SOCK_NONBLOCK
   SOCK_NONBLOCK = 0x40000000	/* Atomically mark descriptor(s) as
 				   non-blocking.  */
 #define SOCK_NONBLOCK SOCK_NONBLOCK
--- a/ports/sysdeps/unix/sysv/linux/hppa/bits/socket_type.h
+++ b/ports/sysdeps/unix/sysv/linux/hppa/bits/socket_type.h
@@ -49,7 +49,9 @@
   SOCK_CLOEXEC = 010000000,	/* Atomically set close-on-exec flag for the
 				   new descriptor(s).  */
 #define SOCK_CLOEXEC SOCK_CLOEXEC
+#ifndef SOCK_NONBLOCK
   SOCK_NONBLOCK = 0x40000000	/* Atomically mark descriptor(s) as
 				   non-blocking.  */
+#endif /* SOCK_NONBLOCK */
 #define SOCK_NONBLOCK SOCK_NONBLOCK
 };