diff --git a/src/listen.c b/src/listen.c
index df523e7a6..fe728be43 100644
--- a/src/listen.c
+++ b/src/listen.c
@@ -35,6 +35,7 @@
 #include <winsock.h>
 #else
 #include <netinet/in.h>
+#include <sys/socket.h>
 #include <sys/un.h>
 #include <netdb.h>
 #endif