diff --git a/ArmPkg/Library/SemiHostingSerialPortLib/SerialPortLib.c b/ArmPkg/Library/SemiHostingSerialPortLib/SerialPortLib.c
index bd8f5b8199..60d8930d6c 100644
--- a/ArmPkg/Library/SemiHostingSerialPortLib/SerialPortLib.c
+++ b/ArmPkg/Library/SemiHostingSerialPortLib/SerialPortLib.c
@@ -98,7 +98,7 @@ SerialPortWrite (
       SemihostWriteString ((CHAR8 *) PrintBuffer);
   }
 
-  return 0;
+  return NumberOfBytes;
 }