diff --git a/fxbarcode/datamatrix/BC_DataMatrixSymbolInfo144.cpp b/fxbarcode/datamatrix/BC_DataMatrixSymbolInfo144.cpp
index 7a18d03..46af38d 100644
--- a/fxbarcode/datamatrix/BC_DataMatrixSymbolInfo144.cpp
+++ b/fxbarcode/datamatrix/BC_DataMatrixSymbolInfo144.cpp
@@ -32,8 +32,3 @@
 int32_t CBC_DataMatrixSymbolInfo144::getInterleavedBlockCount() const {
   return 10;
 }
-
-int32_t CBC_DataMatrixSymbolInfo144getDataLengthForInterleavedBlock(
-    int32_t index) {
-  return index <= 8 ? 156 : 155;
-}