diff --git a/src/libexpr/eval.hh b/src/libexpr/eval.hh
index 627eabf95..5e98f5404 100644
--- a/src/libexpr/eval.hh
+++ b/src/libexpr/eval.hh
@@ -175,7 +175,7 @@ public:
     /* String coercion.  Converts strings, paths and derivations to a
        string.  If `coerceMore' is set, also converts nulls, integers,
        booleans and lists to a string.  If `copyToStore' is set,
-       referenced paths are copied to the Nix store as a side effect.q */
+       referenced paths are copied to the Nix store as a side effect. */
     string coerceToString(Value & v, PathSet & context,
         bool coerceMore = false, bool copyToStore = true);