diff --git a/OvmfPkg/Library/PlatformDebugLibIoPort/DebugLib.c b/OvmfPkg/Library/PlatformDebugLibIoPort/DebugLib.c
index a4c12b9057..6895458cf0 100644
--- a/OvmfPkg/Library/PlatformDebugLibIoPort/DebugLib.c
+++ b/OvmfPkg/Library/PlatformDebugLibIoPort/DebugLib.c
@@ -21,7 +21,7 @@
 //
 // Define the maximum debug and assert message length that this library supports
 //
-#define MAX_DEBUG_MESSAGE_LENGTH  0x100
+#define MAX_DEBUG_MESSAGE_LENGTH  0x200
 
 //
 // VA_LIST can not initialize to NULL for all compiler, so we use this to