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-rw-r--r--src/libexpr/eval.hh2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libexpr/eval.hh b/src/libexpr/eval.hh
index a730dc2977..aff68ea2ab 100644
--- a/src/libexpr/eval.hh
+++ b/src/libexpr/eval.hh
@@ -304,7 +304,7 @@ private:
 
 
 /* Return a string representing the type of the value `v'. */
-string showType(Value & v);
+string showType(const Value & v);
 
 
 }