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-rw-r--r--src/libstore/store-api.hh2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libstore/store-api.hh b/src/libstore/store-api.hh
index ad0f8df11b84..b4e5f5511599 100644
--- a/src/libstore/store-api.hh
+++ b/src/libstore/store-api.hh
@@ -47,7 +47,7 @@ const size_t storePathHashLen = 32; // i.e. 160 bits
 const uint32_t exportMagic = 0x4558494e;
 
 
-typedef std::map<Path, Path> Roots;
+typedef std::map<Path, std::set<std::string>> Roots;
 
 
 struct GCOptions