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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 b0071da83b1b..40ac887140d7 100644
--- a/src/libstore/store-api.hh
+++ b/src/libstore/store-api.hh
@@ -87,6 +87,7 @@ struct SubstitutablePathInfo
     Path deriver;
     PathSet references;
     unsigned long long downloadSize; /* 0 = unknown or inapplicable */
+    unsigned long long narSize; /* 0 = unknown */
 };