diff --git a/lib/kadm5/kadm5_locl.h b/lib/kadm5/kadm5_locl.h
index d5ed8316e..a618ad802 100644
--- a/lib/kadm5/kadm5_locl.h
+++ b/lib/kadm5/kadm5_locl.h
@@ -68,6 +68,9 @@
 #ifdef HAVE_SYS_FILE_H
 #include <sys/file.h>
 #endif
+#ifdef HAVE_SYS_SOCKET_H
+#include <sys/socket.h>
+#endif
 #ifdef HAVE_SYS_UN_H
 #include <sys/un.h>
 #endif