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-rw-r--r--src/libstore/misc.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libstore/misc.cc b/src/libstore/misc.cc
index abe59d1628fb..4ac0afe844b6 100644
--- a/src/libstore/misc.cc
+++ b/src/libstore/misc.cc
@@ -103,10 +103,10 @@ static void dfsVisit(StoreAPI & store, const PathSet & paths,
 {
     if (parents.find(path) != parents.end())
         throw BuildError(format("cycle detected in the references of `%1%'") % path);
-    parents.insert(path);
     
     if (visited.find(path) != visited.end()) return;
     visited.insert(path);
+    parents.insert(path);
     
     PathSet references;
     if (store.isValidPath(path))