diff --git a/DuetPkg/DxeIpl/Debug.c b/DuetPkg/DxeIpl/Debug.c
index 31b89fc49e..26f7ce0037 100644
--- a/DuetPkg/DxeIpl/Debug.c
+++ b/DuetPkg/DxeIpl/Debug.c
@@ -97,6 +97,6 @@ PrintString (
   //
   // All information also output to serial port.
   //
-  DebugSerialPrint (String);
+  DebugSerialPrint ((CHAR8*)String);
 }