diff --git a/src/child.c b/src/child.c
index 06a977e..3ae3d82 100644
--- a/src/child.c
+++ b/src/child.c
@@ -36,11 +36,6 @@
 
 static vector_t listen_fds;
 
-union sockaddr_union {
-        struct sockaddr_in  v4;
-        struct sockaddr_in6 v6;
-};
-
 struct client {
         union sockaddr_union addr;
         int fd;
diff --git a/src/sock.h b/src/sock.h
index f1225ea..a516d4f 100644
--- a/src/sock.h
+++ b/src/sock.h
@@ -28,8 +28,14 @@
 
 #define MAXLINE (1024 * 4)
 
+#include "common.h"
 #include "vector.h"
 
+union sockaddr_union {
+        struct sockaddr_in  v4;
+        struct sockaddr_in6 v6;
+};
+
 extern int opensock (const char *host, int port, const char *bind_to);
 extern int listen_sock (const char *addr, uint16_t port, vector_t listen_fds);