diff --git a/ares/ares_search.c b/ares/ares_search.c
index 3ba26fe11..5131f35b8 100644
--- a/ares/ares_search.c
+++ b/ares/ares_search.c
@@ -23,6 +23,10 @@
 #include <ctype.h>
 #include <errno.h>
 
+#ifdef HAVE_STRINGS_H
+#  include <strings.h>
+#endif
+
 #include "ares.h"
 #include "ares_private.h"