diff --git a/src/unix/gsocket.cpp b/src/unix/gsocket.cpp
index 1ea7b594e5..d417f12da8 100644
--- a/src/unix/gsocket.cpp
+++ b/src/unix/gsocket.cpp
@@ -36,6 +36,14 @@
 #include <types.h>
 #include <netinet/in.h>
 #endif
+#ifdef __NETBSD__
+#ifndef _NETBSD_SOURCE
+#define _NETBSD_SOURCE
+#endif
+#ifndef _LIBC
+#define _LIBC
+#endif
+#endif
 #include <netdb.h>
 #include <sys/ioctl.h>