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-rw-r--r--src/libstore/gc.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libstore/gc.cc b/src/libstore/gc.cc
index d646dd3dec..01d85d4d52 100644
--- a/src/libstore/gc.cc
+++ b/src/libstore/gc.cc
@@ -332,7 +332,7 @@ static void addAdditionalRoots(PathSet & roots)
     for (Strings::iterator i = paths.begin(); i != paths.end(); ++i) {
         if (isInStore(*i)) {
             Path path = toStorePath(*i);
-            if (roots.find(path) == roots.end()) {
+            if (roots.find(path) == roots.end() && isValidPath(path)) {
                 debug(format("found additional root `%1%'") % path);
                 roots.insert(path);
             }