diff --git a/src/hydra-queue-runner/nar-extractor.cc b/src/hydra-queue-runner/nar-extractor.cc
index 61299ecd..9f94af9c 100644
--- a/src/hydra-queue-runner/nar-extractor.cc
+++ b/src/hydra-queue-runner/nar-extractor.cc
@@ -60,26 +60,26 @@ struct Extractor : FileSystemObjectSink
         : members(members), prefix(prefix)
     { }
 
-    void createDirectory(const Path & path) override
+    void createDirectory(const CanonPath & path) override
     {
-        members.insert_or_assign(prefix + path, NarMemberData { .type = SourceAccessor::Type::tDirectory });
+        members.insert_or_assign(prefix + path.abs(), NarMemberData { .type = SourceAccessor::Type::tDirectory });
     }
 
-    void createRegularFile(const Path & path, std::function<void(CreateRegularFileSink &)> func) override
+    void createRegularFile(const CanonPath & path, std::function<void(CreateRegularFileSink &)> func) override
     {
         NarMemberConstructor nmc {
-            members.insert_or_assign(prefix + path, NarMemberData {
+            members.insert_or_assign(prefix + path.abs(), NarMemberData {
                 .type = SourceAccessor::Type::tRegular,
                 .fileSize = 0,
-                .contents = filesToKeep.count(path) ? std::optional("") : std::nullopt,
+                .contents = filesToKeep.count(path.abs()) ? std::optional("") : std::nullopt,
             }).first->second,
         };
         func(nmc);
     }
 
-    void createSymlink(const Path & path, const std::string & target) override
+    void createSymlink(const CanonPath & path, const std::string & target) override
     {
-        members.insert_or_assign(prefix + path, NarMemberData { .type = SourceAccessor::Type::tSymlink });
+        members.insert_or_assign(prefix + path.abs(), NarMemberData { .type = SourceAccessor::Type::tSymlink });
     }
 };