diff --git a/src/libexpr/primops.cc b/src/libexpr/primops.cc
index 87ee4f68a..25bf42e1b 100644
--- a/src/libexpr/primops.cc
+++ b/src/libexpr/primops.cc
@@ -1657,6 +1657,7 @@ void fetch(EvalState & state, const Pos & pos, Value * * args, Value & v,
     if (state.restricted) throw Error(format("‘%1%’ is not allowed in restricted mode") % who);
 
     string url;
+    string name;
 
     state.forceValue(*args[0]);
 
@@ -1665,9 +1666,11 @@ void fetch(EvalState & state, const Pos & pos, Value * * args, Value & v,
         state.forceAttrs(*args[0], pos);
 
         for (auto & attr : *args[0]->attrs) {
-            string name(attr.name);
-            if (name == "url")
+            string n(attr.name);
+            if (n == "url")
                 url = state.forceStringNoCtx(*attr.value, *attr.pos);
+            else if (n == "name")
+                name = state.forceStringNoCtx(*attr.value, *attr.pos);
             else
                 throw EvalError(format("unsupported argument ‘%1%’ to ‘%2%’, at %3%") % attr.name % who % attr.pos);
         }
@@ -1678,7 +1681,7 @@ void fetch(EvalState & state, const Pos & pos, Value * * args, Value & v,
     } else
         url = state.forceStringNoCtx(*args[0], pos);
 
-    Path res = downloadFileCached(url, unpack);
+    Path res = downloadFileCached(url, unpack, name);
     mkString(v, res, PathSet({res}));
 }
 
diff --git a/src/libstore/download.cc b/src/libstore/download.cc
index 822e9a8db..3bc02e3c4 100644
--- a/src/libstore/download.cc
+++ b/src/libstore/download.cc
@@ -188,7 +188,7 @@ DownloadResult downloadFile(string url, const DownloadOptions & options)
 }
 
 
-Path downloadFileCached(const string & url, bool unpack)
+Path downloadFileCached(const string & url, bool unpack, string name)
 {
     Path cacheDir = getEnv("XDG_CACHE_HOME", getEnv("HOME", "") + "/.cache") + "/nix/tarballs";
     createDirs(cacheDir);
@@ -223,9 +223,10 @@ Path downloadFileCached(const string & url, bool unpack)
             storePath = "";
     }
 
-    string name;
-    auto p = url.rfind('/');
-    if (p != string::npos) name = string(url, p + 1);
+    if (name == "") {
+        auto p = url.rfind('/');
+        if (p != string::npos) name = string(url, p + 1);
+    }
 
     if (!skip) {
 
diff --git a/src/libstore/download.hh b/src/libstore/download.hh
index c1cb25b90..8d025d1cf 100644
--- a/src/libstore/download.hh
+++ b/src/libstore/download.hh
@@ -20,7 +20,7 @@ struct DownloadResult
 
 DownloadResult downloadFile(string url, const DownloadOptions & options);
 
-Path downloadFileCached(const string & url, bool unpack);
+Path downloadFileCached(const string & url, bool unpack, string name = "");
 
 MakeError(DownloadError, Error)