diff --git a/src/recipe/lang/Haskell.c b/src/recipe/lang/Haskell.c
index f07e3c5..40413ba 100644
--- a/src/recipe/lang/Haskell.c
+++ b/src/recipe/lang/Haskell.c
@@ -22,7 +22,7 @@ pl_haskell_prelude ()
   chef_allow_user_define(this);
 
   def_sources_begin()
-  {&UpstreamProvider, NULL, DelegateToUpstream},
+  {&UpstreamProvider, "https://hackage.haskell.org", DelegateToUpstream},
   {&Tuna,             "https://mirrors.tuna.tsinghua.edu.cn/hackage", DelegateToMirror},
   {&Bfsu,             "https://mirrors.bfsu.edu.cn/hackage",          DelegateToMirror},
   {&Nju,              "https://mirror.nju.edu.cn/hackage",             DelegateToMirror},
diff --git a/src/recipe/lang/Julia.c b/src/recipe/lang/Julia.c
index e8815fd..7f8c818 100644
--- a/src/recipe/lang/Julia.c
+++ b/src/recipe/lang/Julia.c
@@ -22,7 +22,7 @@ pl_julia_prelude ()
   chef_allow_user_define(this);
 
   def_sources_begin()
-  {&UpstreamProvider,  NULL, DelegateToUpstream},
+  {&UpstreamProvider, "https://pkg.julialang.org", DelegateToUpstream},
   {&Pku,              "https://mirrors.pku.edu.cn/julia", DelegateToMirror},
   {&Nju,              "https://mirror.nju.edu.cn/julia",   DelegateToMirror},
   {&Iscas,            "https://mirror.iscas.ac.cn/julia",  DelegateToMirror}
diff --git a/src/recipe/lang/Lua.c b/src/recipe/lang/Lua.c
index 42b179d..249b1e4 100644
--- a/src/recipe/lang/Lua.c
+++ b/src/recipe/lang/Lua.c
@@ -29,7 +29,7 @@ pl_lua_prelude ()
   chef_allow_user_define(this);
 
   def_sources_begin()
-  {&UpstreamProvider,  NULL, DelegateToUpstream},
+  {&UpstreamProvider, "https://luarocks.org", DelegateToUpstream},
   {&Api7,             "https://luarocks.cn", DelegateToMirror}
   def_sources_end()
 }