diff --git a/tests/ut/ge/common/format_transfer_unittest.cc b/tests/ut/ge/common/format_transfer_unittest.cc
index fd2a296c..4fcfb378 100644
--- a/tests/ut/ge/common/format_transfer_unittest.cc
+++ b/tests/ut/ge/common/format_transfer_unittest.cc
@@ -79,7 +79,7 @@ TEST_F(UtestFormatTransfer, get_size_by_data_type) {
   EXPECT_EQ(GetSizeByDataType(DT_STRING_REF), -1);
   EXPECT_EQ(GetSizeByDataType(DT_DUAL), 5);
   EXPECT_EQ(GetSizeByDataType(DT_UNDEFINED), -1);
-  EXPECT_EQ(DT_UNDEFINED, 27);
+  EXPECT_EQ(DT_UNDEFINED, 26);
 }
 }  // namespace formats
 }  // namespace ge