diff --git a/IntelFrameworkModulePkg/Universal/StatusCode/Pei/SerialStatusCodeWorker.c b/IntelFrameworkModulePkg/Universal/StatusCode/Pei/SerialStatusCodeWorker.c
index 1b409310cf..c3cac2b6ac 100644
--- a/IntelFrameworkModulePkg/Universal/StatusCode/Pei/SerialStatusCodeWorker.c
+++ b/IntelFrameworkModulePkg/Universal/StatusCode/Pei/SerialStatusCodeWorker.c
@@ -94,7 +94,7 @@ SerialStatusCodeReportWorker (
 
     if (CallerId != NULL) {
       CharCount += AsciiSPrint (
-                     &Buffer[CharCount - 1],
+                     &Buffer[CharCount],
                      (sizeof (Buffer) - (sizeof (Buffer[0]) * CharCount)),
                      " %g",
                      CallerId
@@ -103,7 +103,7 @@ SerialStatusCodeReportWorker (
 
     if (Data != NULL) {
       CharCount += AsciiSPrint (
-                     &Buffer[CharCount - 1],
+                     &Buffer[CharCount],
                      (sizeof (Buffer) - (sizeof (Buffer[0]) * CharCount)),
                      " %x",
                      Data
@@ -111,7 +111,7 @@ SerialStatusCodeReportWorker (
     }
 
     CharCount += AsciiSPrint (
-                   &Buffer[CharCount - 1],
+                   &Buffer[CharCount],
                    (sizeof (Buffer) - (sizeof (Buffer[0]) * CharCount)),
                    "\n\r"
                    );
diff --git a/IntelFrameworkModulePkg/Universal/StatusCode/RuntimeDxe/SerialStatusCodeWorker.c b/IntelFrameworkModulePkg/Universal/StatusCode/RuntimeDxe/SerialStatusCodeWorker.c
index c4e9e3340b..3ebaaed6cd 100644
--- a/IntelFrameworkModulePkg/Universal/StatusCode/RuntimeDxe/SerialStatusCodeWorker.c
+++ b/IntelFrameworkModulePkg/Universal/StatusCode/RuntimeDxe/SerialStatusCodeWorker.c
@@ -92,7 +92,7 @@ SerialStatusCodeReportWorker (
    
     if (CallerId != NULL) {
       CharCount += AsciiSPrint (
-                     &Buffer[CharCount - 1],
+                     &Buffer[CharCount],
                      (sizeof (Buffer) - (sizeof (Buffer[0]) * CharCount)),
                      " %g",
                      CallerId
@@ -101,7 +101,7 @@ SerialStatusCodeReportWorker (
 
     if (Data != NULL) {
       CharCount += AsciiSPrint (
-                     &Buffer[CharCount - 1],
+                     &Buffer[CharCount],
                      (sizeof (Buffer) - (sizeof (Buffer[0]) * CharCount)),
                      " %x",
                      Data
@@ -109,7 +109,7 @@ SerialStatusCodeReportWorker (
     }
 
     CharCount += AsciiSPrint (
-                   &Buffer[CharCount - 1],
+                   &Buffer[CharCount],
                    (sizeof (Buffer) - (sizeof (Buffer[0]) * CharCount)),
                    "\n\r"
                    );