diff --git a/src/common/inet.h b/src/common/inet.h
index 36d5bb60..e95a375f 100644
--- a/src/common/inet.h
+++ b/src/common/inet.h
@@ -34,6 +34,10 @@
 #endif
 #ifdef WANTDNS
 #include <netdb.h>
+/* OpenBSD's netdb.h does not define AI_ADDRCONFIG */
+#ifndef AI_ADDRCONFIG
+#define AI_ADDRCONFIG 0
+#endif
 #endif
 #define closesocket close
 #define set_blocking(sok) fcntl(sok, F_SETFL, 0)