diff --git a/fxbarcode/oned/BC_OnedCodaBarWriter.cpp b/fxbarcode/oned/BC_OnedCodaBarWriter.cpp
index c4334c6..eb330a9 100644
--- a/fxbarcode/oned/BC_OnedCodaBarWriter.cpp
+++ b/fxbarcode/oned/BC_OnedCodaBarWriter.cpp
@@ -22,6 +22,7 @@
 
 #include "fxbarcode/oned/BC_OnedCodaBarWriter.h"
 
+#include "core/fxcrt/fx_extension.h"
 #include "fxbarcode/BC_Writer.h"
 #include "fxbarcode/common/BC_CommonBitMatrix.h"
 #include "fxbarcode/oned/BC_OneDimWriter.h"
@@ -139,10 +140,7 @@
   char ch;
   int32_t position = 0;
   for (size_t index = 0; index < data.GetLength(); index++) {
-    ch = data[index];
-    if (((ch >= 'a') && (ch <= 'z'))) {
-      ch = ch - 32;
-    }
+    ch = FXSYS_ToUpperASCII(data[index]);
     switch (ch) {
       case 'T':
         ch = 'A';