diff --git a/src/unix/internal.h b/src/unix/internal.h
index 1adb5f20..3ae5d054 100644
--- a/src/unix/internal.h
+++ b/src/unix/internal.h
@@ -59,6 +59,18 @@
 #  define HAVE_SYS_ACCEPT4 1
 # endif
 
+# ifndef O_CLOEXEC
+#  define O_CLOEXEC 02000000
+# endif
+
+# ifndef SOCK_CLOEXEC
+#  define SOCK_CLOEXEC O_CLOEXEC
+# endif
+
+# ifndef SOCK_NONBLOCK
+#  define SOCK_NONBLOCK O_NONBLOCK
+# endif
+
 # if HAVE_SYS_UTIMESAT
 inline static int sys_utimesat(int dirfd,
                                const char* path,