diff --git a/apps/apps.h b/apps/apps.h
index f2dc812492..99c58095f0 100644
--- a/apps/apps.h
+++ b/apps/apps.h
@@ -450,7 +450,7 @@ ENGINE *setup_engine(const char *engine, int debug);
 OCSP_RESPONSE *process_responder(OCSP_REQUEST *req,
                                  const char *host, const char *path,
                                  const char *port, int use_ssl,
-                                 const STACK_OF(CONF_VALUE) *headers,
+                                 STACK_OF(CONF_VALUE) *headers,
                                  int req_timeout);
 # endif
 
diff --git a/apps/ocsp.c b/apps/ocsp.c
index 5b3092a4d2..7193dae20b 100644
--- a/apps/ocsp.c
+++ b/apps/ocsp.c
@@ -1256,7 +1256,7 @@ static OCSP_RESPONSE *query_responder(BIO *cbio, const char *path,
 OCSP_RESPONSE *process_responder(OCSP_REQUEST *req,
                                  const char *host, const char *path,
                                  const char *port, int use_ssl,
-                                 const STACK_OF(CONF_VALUE) *headers,
+                                 STACK_OF(CONF_VALUE) *headers,
                                  int req_timeout)
 {
     BIO *cbio = NULL;