diff --git a/appveyor.yml b/appveyor.yml
index a731df2..d4b0560 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -7,7 +7,7 @@ shallow_clone: true
 
 environment:
   LR_EXTERNAL: c:\external
-  CURL_VER: 7.52.1
+  CURL_VER: 7.53.1
 
   matrix:
   - LUA: "lua 5.1"
diff --git a/src/lcopteasy.h b/src/lcopteasy.h
index 4a16066..c837e4f 100644
--- a/src/lcopteasy.h
+++ b/src/lcopteasy.h
@@ -376,6 +376,10 @@ OPT_ENTRY( pre_proxy,              PRE_PROXY,              STR, 0, LCURL_DEFAULT
 OPT_ENTRY( proxy_pinnedpublickey,  PROXY_PINNEDPUBLICKEY,  STR, 0, LCURL_DEFAULT_VALUE)
 #endif
 
+#if LCURL_CURL_VER_GE(7,53,0)
+OPT_ENTRY( abstract_unix_socket,   ABSTRACT_UNIX_SOCKET,  STR, 0, LCURL_DEFAULT_VALUE)
+#endif
+
 #ifdef LCURL__TCP_FASTOPEN
 #  define TCP_FASTOPEN LCURL__TCP_FASTOPEN
 #  undef LCURL__TCP_FASTOPEN