diff --git a/src/core/ngx_resolver.c b/src/core/ngx_resolver.c

index 593645d..064ec7a 100644

--- a/src/core/ngx_resolver.c

+++ b/src/core/ngx_resolver.c

@@ -3992,15 +3992,15 @@ done:

             n = *src++;

         } else {

+            if (dst != name->data) {

+                *dst++ = '.';

+            }

+

             ngx_strlow(dst, src, n);

             dst += n;

             src += n;

             n = *src++;

-

-            if (n != 0) {

-                *dst++ = '.';

-            }

         }

         if (n == 0) {