diff --git a/mindspore/ccsrc/minddata/dataset/engine/datasetops/source/csv_op.cc b/mindspore/ccsrc/minddata/dataset/engine/datasetops/source/csv_op.cc
index 7a84d14085744ee5c366eb149fcd82b9315e82d8..18374bb0f4523565d00643f3a98eb74d1c0070e0 100644
--- a/mindspore/ccsrc/minddata/dataset/engine/datasetops/source/csv_op.cc
+++ b/mindspore/ccsrc/minddata/dataset/engine/datasetops/source/csv_op.cc
@@ -168,7 +168,7 @@ int CsvOp::CsvParser::end_file(char c) {
   return 0;
 }
 
-int CsvOp::CsvParser::countRows(char c) {
+int CsvOp::CsvParser::countRows(int c) {
   Message m;
   if (c == '"') {
     m = Message::MS_QUOTE;
@@ -701,7 +701,7 @@ int64_t CsvOp::CountTotalRows(const std::string &file) {
   }
   csv_parser.Reset();
   while (ifs.good()) {
-    char chr = ifs.get();
+    int chr = ifs.get();
     if (csv_parser.countRows(chr) != 0) {
       break;
     }
diff --git a/mindspore/ccsrc/minddata/dataset/engine/datasetops/source/csv_op.h b/mindspore/ccsrc/minddata/dataset/engine/datasetops/source/csv_op.h
index 3201d1df4fcea974e51bfab4ec47da7b937ff312..1921b61bdcae3deffe7354be31a3da16c7062a11 100644
--- a/mindspore/ccsrc/minddata/dataset/engine/datasetops/source/csv_op.h
+++ b/mindspore/ccsrc/minddata/dataset/engine/datasetops/source/csv_op.h
@@ -105,7 +105,7 @@ class CsvOp : public ParallelOp {
       return it->second.second(*this, c);
     }
 
-    int countRows(char c);
+    int countRows(int c);
 
     Status initCsvParser();