diff --git a/src/libstore/build.cc b/src/libstore/build.cc
index d04513ddb..3fd1a7b38 100644
--- a/src/libstore/build.cc
+++ b/src/libstore/build.cc
@@ -2578,6 +2578,7 @@ void DerivationGoal::writeStructuredAttrs()
     }
 
     writeFile(tmpDir + "/.attrs.json", rewriteStrings(json.dump(), inputRewrites));
+    chownToBuilder(tmpDir + "/.attrs.json");
 
     /* As a convenience to bash scripts, write a shell file that
        maps all attributes that are representable in bash -
@@ -2646,6 +2647,7 @@ void DerivationGoal::writeStructuredAttrs()
     }
 
     writeFile(tmpDir + "/.attrs.sh", rewriteStrings(jsonSh, inputRewrites));
+    chownToBuilder(tmpDir + "/.attrs.sh");
 }