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-rw-r--r--src/libstore/store-api.hh1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libstore/store-api.hh b/src/libstore/store-api.hh
index 8506d47e36a7..23a3ab25e470 100644
--- a/src/libstore/store-api.hh
+++ b/src/libstore/store-api.hh
@@ -333,6 +333,7 @@ struct ValidPathInfo
     Hash hash;
     PathSet references;
     time_t registrationTime;
+    unsigned long long id; // internal use only
     ValidPathInfo() : registrationTime(0) { }
 };