diff --git a/kdc/headers.h b/kdc/headers.h
index f8157acc7..c2bd4c5b4 100644
--- a/kdc/headers.h
+++ b/kdc/headers.h
@@ -72,6 +72,9 @@
 #ifdef HAVE_ARPA_INET_H
 #include <arpa/inet.h>
 #endif
+#ifdef HAVE_SYS_WAIT_H
+#include <sys/wait.h>
+#endif
 #ifdef HAVE_NETDB_H
 #include <netdb.h>
 #endif