diff --git a/src/libstore/derivations.cc b/src/libstore/derivations.cc
index a85a70c0a..f41edd81d 100644
--- a/src/libstore/derivations.cc
+++ b/src/libstore/derivations.cc
@@ -396,7 +396,7 @@ Hash hashDerivationModulo(Store & store, const Derivation & drv, bool maskOutput
         if (h == drvHashes.end()) {
             assert(store.isValidPath(i.first));
             h = drvHashes.insert_or_assign(i.first, hashDerivationModulo(store,
-                    store.readDerivation(i.first), false)).first;
+                store.readDerivation(i.first), false)).first;
         }
         inputs2.insert_or_assign(h->second.to_string(Base16, false), i.second);
     }