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-rw-r--r--src/libstore/store.cc4
1 files changed, 2 insertions, 2 deletions
diff --git a/src/libstore/store.cc b/src/libstore/store.cc
index d61c3e454705..12045fc35bec 100644
--- a/src/libstore/store.cc
+++ b/src/libstore/store.cc
@@ -63,7 +63,7 @@ static TableId dbSubstitutes = 0;
 static TableId dbDerivers = 0;
 
 
-bool Substitute::operator == (const Substitute & sub)
+bool Substitute::operator == (const Substitute & sub) const
 {
     return program == sub.program
         && args == sub.args;
@@ -170,7 +170,7 @@ void copyPath(const Path & src, const Path & dst)
 bool isInStore(const Path & path)
 {
     return path[0] == '/'
-        && path.compare(0, nixStore.size(), nixStore) == 0
+        && string(path, 0, nixStore.size()) == nixStore
         && path.size() >= nixStore.size() + 2
         && path[nixStore.size()] == '/';
 }