diff --git a/beamerouterthememetropolis.dtx b/beamerouterthememetropolis.dtx
index 9d7d522..56bd467 100644
--- a/beamerouterthememetropolis.dtx
+++ b/beamerouterthememetropolis.dtx
@@ -88,7 +88,7 @@
        }
        },
     uppercase/.code={%
-       \renewcommand{\@metropolis@frametitleformat}{\myletterspacing\MakeUppercase}%
+       \renewcommand{\@metropolis@frametitleformat}{\MakeUppercase}%
        \renewcommand{\@metropolis@frametitlestrut}{%
            \rule{0pt}{\heightof{ABCDEFGHIJKLMNOPQRSTUVWXYZ}}
        }