diff --git a/lib/roken/roken.awk b/lib/roken/roken.awk
index 47ae1960a..47313c843 100644
--- a/lib/roken/roken.awk
+++ b/lib/roken/roken.awk
@@ -9,6 +9,9 @@ BEGIN {
 	print "#ifdef HAVE_SYS_SOCKET_H"
 	print "#include <sys/socket.h>"
 	print "#endif"
+	print "#ifdef HAVE_ERRNO_H"
+	print "#include <errno.h>"
+	print "#endif"
 	print ""
 	print "int main(int argc, char **argv)"
 	print "{"