diff --git a/beamerthemem.dtx b/beamerthemem.dtx
index 82971ca..284a832 100644
--- a/beamerthemem.dtx
+++ b/beamerthemem.dtx
@@ -497,7 +497,7 @@
     \ifbeamer@inframe
       \sectionpage
     \else
-      \frame[plain]{\sectionpage}
+      \frame[plain,c]{\sectionpage}
     \fi
   }
 \fi