diff --git a/src/libstore/build/entry-points.cc b/src/libstore/build/entry-points.cc
index 74eca63f3..7f0a05d5d 100644
--- a/src/libstore/build/entry-points.cc
+++ b/src/libstore/build/entry-points.cc
@@ -26,9 +26,9 @@ void Store::buildPaths(const std::vector<DerivedPath> & reqs, BuildMode buildMod
         }
         if (i->exitCode != Goal::ecSuccess) {
             if (auto i2 = dynamic_cast<DerivationGoal *>(i.get()))
-                failed.insert(std::string { i2->drvPath.to_string() });
+                failed.insert(printStorePath(i2->drvPath));
             else if (auto i2 = dynamic_cast<PathSubstitutionGoal *>(i.get()))
-                failed.insert(std::string { i2->storePath.to_string()});
+                failed.insert(printStorePath(i2->storePath));
         }
     }