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-rw-r--r--src/libstore/builtins.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libstore/builtins.cc b/src/libstore/builtins.cc
index 50417b644a02..a4785d6905bb 100644
--- a/src/libstore/builtins.cc
+++ b/src/libstore/builtins.cc
@@ -31,7 +31,7 @@ void builtinFetchurl(const BasicDerivation & drv)
     auto unpack = drv.env.find("unpack");
     if (unpack != drv.env.end() && unpack->second == "1") {
         if (string(*data.data, 0, 6) == string("\xfd" "7zXZ\0", 6))
-            data.data = decompressXZ(*data.data);
+            data.data = decompress("xz", ref<std::string>(data.data));
         StringSource source(*data.data);
         restorePath(storePath, source);
     } else