diff --git a/config.h b/config.h
index bf325105..42658599 100644
--- a/config.h
+++ b/config.h
@@ -6,10 +6,14 @@
 
 #ifdef __APPLE__
 #  define __DARWIN_C_SOURCE
-#elif defined(__FreeBSD__) || defined(__NetBSD__) || defined(__SYMBIAN32__) || defined(__QNX__)
+#elif defined(__FreeBSD__) || defined(__NetBSD__) || defined(__SYMBIAN32__)
 #  define _XOPEN_SOURCE 700
 #  define __BSD_VISIBLE 1
 #  define HAVE_NETINET_IN_H
+#elif defined(__QNX__)
+#  define _XOPEN_SOURCE 600
+#  define __BSD_VISIBLE 1
+#  define HAVE_NETINET_IN_H
 #else
 #  define _XOPEN_SOURCE 700
 #  define _DEFAULT_SOURCE 1