diff --git a/src/libstore/build/local-derivation-goal.cc b/src/libstore/build/local-derivation-goal.cc
index a961d8eed..b5bdc0449 100644
--- a/src/libstore/build/local-derivation-goal.cc
+++ b/src/libstore/build/local-derivation-goal.cc
@@ -1155,10 +1155,10 @@ void LocalDerivationGoal::writeStructuredAttrs()
 
         writeFile(tmpDir + "/.attrs.sh", rewriteStrings(jsonSh, inputRewrites));
         chownToBuilder(tmpDir + "/.attrs.sh");
-        env["NIX_ATTRS_SH_FILE"] = tmpDir + "/.attrs.sh";
+        env["NIX_ATTRS_SH_FILE"] = tmpDirInSandbox + "/.attrs.sh";
         writeFile(tmpDir + "/.attrs.json", rewriteStrings(json.dump(), inputRewrites));
         chownToBuilder(tmpDir + "/.attrs.json");
-        env["NIX_ATTRS_JSON_FILE"] = tmpDir + "/.attrs.json";
+        env["NIX_ATTRS_JSON_FILE"] = tmpDirInSandbox + "/.attrs.json";
     }
 }