diff --git a/modules/proxy/mod_proxy.h b/modules/proxy/mod_proxy.h
index df7a0b67d1..ce7e157255 100644
--- a/modules/proxy/mod_proxy.h
+++ b/modules/proxy/mod_proxy.h
@@ -267,6 +267,6 @@ PROXY_DECLARE(int) ap_proxy_checkproxyblock(request_rec *r, proxy_server_conf *c
 PROXY_DECLARE(int) ap_proxy_pre_http_request(conn_rec *c, request_rec *r);
 PROXY_DECLARE(apr_status_t) ap_proxy_string_read(conn_rec *c, apr_bucket_brigade *bb, char *buff, size_t bufflen, int *eos);
 PROXY_DECLARE(void) ap_proxy_reset_output_filters(conn_rec *c);
-
+PROXY_DECLARE(void) ap_proxy_table_unmerge(apr_pool_t *p, apr_table_t *t, char *key);
 
 #endif /*MOD_PROXY_H*/
diff --git a/modules/proxy/proxy_util.c b/modules/proxy/proxy_util.c
index 37c65fd213..8181b85ad8 100644
--- a/modules/proxy/proxy_util.c
+++ b/modules/proxy/proxy_util.c
@@ -1074,7 +1074,7 @@ PROXY_DECLARE(void) ap_proxy_reset_output_filters(conn_rec *c)
 }
 
 /* unmerge an element in the table */
-void ap_proxy_table_unmerge(apr_pool_t *p, apr_table_t *t, char *key)
+PROXY_DECLARE(void) ap_proxy_table_unmerge(apr_pool_t *p, apr_table_t *t, char *key)
 {
     apr_off_t offset = 0;
     apr_off_t count = 0;