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-rw-r--r--src/nix/legacy.hh1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/nix/legacy.hh b/src/nix/legacy.hh
index b67b70eb5c85..f503b0da3e1a 100644
--- a/src/nix/legacy.hh
+++ b/src/nix/legacy.hh
@@ -2,6 +2,7 @@
 
 #include <functional>
 #include <map>
+#include <string>
 
 namespace nix {