diff --git a/src/reqs.c b/src/reqs.c
index dfb39fb..c5217e9 100644
--- a/src/reqs.c
+++ b/src/reqs.c
@@ -1223,7 +1223,7 @@ PULL_CLIENT_DATA:
 static int
 process_server_headers (struct conn_s *connptr)
 {
-  static char *skipheaders[] = {
+  static const char *skipheaders[] = {
     "keep-alive",
     "proxy-authenticate",
     "proxy-authorization",