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-rw-r--r--src/libexpr/nixexpr.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libexpr/nixexpr.cc b/src/libexpr/nixexpr.cc
index 7502fd1663f5..123513594512 100644
--- a/src/libexpr/nixexpr.cc
+++ b/src/libexpr/nixexpr.cc
@@ -319,7 +319,7 @@ struct Canonicalise : TermFun
 };
 
 
-Expr canonicaliseExpr(Expr & e)
+Expr canonicaliseExpr(Expr e)
 {
     Canonicalise canonicalise;
     return bottomupRewrite(canonicalise, e);