diff --git a/src/core/ngx_connection.c b/src/core/ngx_connection.c
index 553a938f6..827be88db 100644
--- a/src/core/ngx_connection.c
+++ b/src/core/ngx_connection.c
@@ -1034,6 +1034,7 @@ ngx_connection_local_sockaddr(ngx_connection_t *c, ngx_str_t *s,
 #if (NGX_HAVE_INET6)
     case AF_INET6:
         sin6 = (struct sockaddr_in6 *) c->local_sockaddr;
+        len = sizeof(struct sockaddr_in6);
 
         for (addr = 0, i = 0; addr == 0 && i < 16; i++) {
             addr |= sin6->sin6_addr.s6_addr[i];
@@ -1044,6 +1045,7 @@ ngx_connection_local_sockaddr(ngx_connection_t *c, ngx_str_t *s,
 
     default: /* AF_INET */
         sin = (struct sockaddr_in *) c->local_sockaddr;
+        len = sizeof(struct sockaddr_in);
         addr = sin->sin_addr.s_addr;
         break;
     }