diff --git a/src/libstore/derivations.hh b/src/libstore/derivations.hh
index d48266774..6d292b2e5 100644
--- a/src/libstore/derivations.hh
+++ b/src/libstore/derivations.hh
@@ -61,8 +61,6 @@ typedef std::map<string, DerivationOutput> DerivationOutputs;
    also contains, for each output, the (optional) store path in which it would
    be written. To calculate values of these types, see the corresponding
    functions in BasicDerivation */
-typedef std::map<string, std::pair<DerivationOutput, StorePath>>
-  DerivationOutputsAndPaths;
 typedef std::map<string, std::pair<DerivationOutput, std::optional<StorePath>>>
   DerivationOutputsAndOptPaths;