1 files changed, 7 insertions, 3 deletions
diff --git a/src/libstore/misc.cc b/src/libstore/misc.cc
index dc991e227..128c3c987 100644
--- a/src/libstore/misc.cc
+++ b/src/libstore/misc.cc
@@ -111,10 +111,14 @@ void Store::computeFSClosure(const StorePath & startPath,
 std::optional<std::string> getDerivationCA(const BasicDerivation & drv)
 {
     auto outputHashMode = drv.env.find("outputHashMode");
-    auto outputHashAlgo = drv.env.find("outputHashAlgo");
     auto outputHash = drv.env.find("outputHash");
-    if (outputHashMode != drv.env.end() && outputHashAlgo != drv.env.end() && outputHash != drv.env.end()) {
-        auto ht = parseHashType(outputHashAlgo->second);
+
+    std::optional<HashType> ht = std::nullopt;
+    auto outputHashAlgo = drv.env.find("outputHashAlgo");
+    if (outputHashAlgo != drv.env.end())
+        ht = parseHashTypeOpt(outputHashAlgo->second);
+
+    if (outputHashMode != drv.env.end() && outputHash != drv.env.end()) {
         auto h = Hash(outputHash->second, ht);
         FileIngestionMethod ingestionMethod;
         if (outputHashMode->second == "recursive")