diff --git a/src/main.h b/src/main.h
index bae48367..51b852fb 100644
--- a/src/main.h
+++ b/src/main.h
@@ -32,7 +32,7 @@
 #include <sys/un.h>
 #include <sys/uio.h>
 
-#ifdef __FreeBSD__
+#if defined(__FreeBSD__) || defined(__OpenBSD__)
 # include <limits.h>
 # define SOL_IP IPPROTO_IP
 #endif