--- a/src/core/ngx_inet.c
+++ b/src/core/ngx_inet.c
@@ -68,6 +68,9 @@ ngx_sock_ntop(struct sockaddr *sa, u_cha
     size_t                n;
     struct sockaddr_in6  *sin6;
 #endif
+#if (NGX_HAVE_UNIX_DOMAIN)
+    struct sockaddr_un   *saun;
+#endif
 
     switch (sa->sa_family) {
 
@@ -108,6 +111,17 @@ ngx_sock_ntop(struct sockaddr *sa, u_cha
         return n;
 #endif
 
+#if (NGX_HAVE_UNIX_DOMAIN)
+
+    case AF_UNIX:
+        saun = (struct sockaddr_un *) sa;
+
+        /* we do not include trailing zero in address length */
+
+        return ngx_snprintf(text, len, "unix:%s%Z", saun->sun_path) - text - 1;
+
+#endif
+
     default:
         return 0;
     }