2 files changed, 2 insertions, 2 deletions
diff --git a/spline/axis-opts.cpp b/spline/axis-opts.cpp
index d7616939..b5f11aaa 100644
--- a/spline/axis-opts.cpp
+++ b/spline/axis-opts.cpp
@@ -39,7 +39,7 @@ QString const& axis_opts::prefix() const { return prefix_; }
 
 Axis axis_opts::axis() const { return axis_; }
 
-QString axis_opts::n(QString pfx, QString name)
+QString axis_opts::n(QString const& pfx, QString const& name)
 {
     return QString("%1-%2").arg(pfx, name);
 }
diff --git a/spline/axis-opts.hpp b/spline/axis-opts.hpp
index 2f0d8432..a76ea3cf 100644
--- a/spline/axis-opts.hpp
+++ b/spline/axis-opts.hpp
@@ -50,7 +50,7 @@ struct OTR_SPLINE_EXPORT axis_opts final
     QString const& prefix() const;
     Axis axis() const;
 private:
-    static inline QString n(QString pfx, QString name);
+    static inline QString n(QString const& pfx, QString const& name);
 
     QString prefix_;
     Axis axis_;