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-rw-r--r--src/libexpr/nixexpr.hh2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libexpr/nixexpr.hh b/src/libexpr/nixexpr.hh
index d76bc1060d33..420911a8769b 100644
--- a/src/libexpr/nixexpr.hh
+++ b/src/libexpr/nixexpr.hh
@@ -96,7 +96,7 @@ void checkVarDefs(const ATermMap & def, Expr e);
 
 /* Canonicalise a Nix expression by sorting attributes and removing
    location information. */
-Expr canonicaliseExpr(Expr & e);
+Expr canonicaliseExpr(Expr e);
 
 
 /* Create an expression representing a boolean. */