diff --git a/support/support_format_addrinfo.c b/support/support_format_addrinfo.c
index cbc72910a9..77f4db345c 100644
--- a/support/support_format_addrinfo.c
+++ b/support/support_format_addrinfo.c
@@ -22,6 +22,7 @@
 #include <errno.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <support/support.h>
 #include <support/xmemstream.h>