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-rw-r--r--src/fstate.hh2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/fstate.hh b/src/fstate.hh
index 681a8d094180..969abe9e0632 100644
--- a/src/fstate.hh
+++ b/src/fstate.hh
@@ -63,7 +63,7 @@ Hash hashTerm(ATerm t);
 ATerm termFromId(const FSId & id);
 
 /* Write an aterm to the Nix store directory, and return its hash. */
-FSId writeTerm(ATerm t, const string & suffix);
+FSId writeTerm(ATerm t, const string & suffix, FSId id = FSId());
 
 /* Parse an fstate-expression. */
 FState parseFState(ATerm t);