diff --git a/sherpa-onnx/csrc/offline-recognizer-ctc-impl.h b/sherpa-onnx/csrc/offline-recognizer-ctc-impl.h
index d0bbb8048..a4398d60d 100644
--- a/sherpa-onnx/csrc/offline-recognizer-ctc-impl.h
+++ b/sherpa-onnx/csrc/offline-recognizer-ctc-impl.h
@@ -43,7 +43,7 @@ static OfflineRecognitionResult Convert(const OfflineCtcDecoderResult &src,
     auto sym = sym_table[src.tokens[i]];
     text.append(sym);
 
-    if (sym.size() == 1 and sym[0] != ' ') {
+    if (sym.size() == 1 && sym[0] != ' ') {
       // for byte bpe models
       std::ostringstream os;
       os << "<0x" << std::hex << std::uppercase << static_cast<uint8_t>(sym[0])
diff --git a/sherpa-onnx/csrc/offline-recognizer-transducer-impl.h b/sherpa-onnx/csrc/offline-recognizer-transducer-impl.h
index b1e47c17a..e51411764 100644
--- a/sherpa-onnx/csrc/offline-recognizer-transducer-impl.h
+++ b/sherpa-onnx/csrc/offline-recognizer-transducer-impl.h
@@ -44,7 +44,7 @@ static OfflineRecognitionResult Convert(
     auto sym = sym_table[i];
     text.append(sym);
 
-    if (sym.size() == 1 and sym[0] != ' ') {
+    if (sym.size() == 1 && sym[0] != ' ') {
       // for byte bpe models
       std::ostringstream os;
       os << "<0x" << std::hex << std::uppercase << static_cast<uint8_t>(sym[0])
diff --git a/sherpa-onnx/csrc/online-recognizer-ctc-impl.h b/sherpa-onnx/csrc/online-recognizer-ctc-impl.h
index 81e8c1827..4c35e3889 100644
--- a/sherpa-onnx/csrc/online-recognizer-ctc-impl.h
+++ b/sherpa-onnx/csrc/online-recognizer-ctc-impl.h
@@ -36,7 +36,7 @@ static OnlineRecognizerResult Convert(const OnlineCtcDecoderResult &src,
 
     r.text.append(sym);
 
-    if (sym.size() == 1 and sym[0] != ' ') {
+    if (sym.size() == 1 && sym[0] != ' ') {
       // for byte bpe models
       std::ostringstream os;
       os << "<0x" << std::hex << std::uppercase << static_cast<uint8_t>(sym[0])
diff --git a/sherpa-onnx/csrc/online-recognizer-transducer-impl.h b/sherpa-onnx/csrc/online-recognizer-transducer-impl.h
index 16a95208a..9a0c68d00 100644
--- a/sherpa-onnx/csrc/online-recognizer-transducer-impl.h
+++ b/sherpa-onnx/csrc/online-recognizer-transducer-impl.h
@@ -48,7 +48,7 @@ static OnlineRecognizerResult Convert(const OnlineTransducerDecoderResult &src,
 
     r.text.append(sym);
 
-    if (sym.size() == 1 and sym[0] != ' ') {
+    if (sym.size() == 1 && sym[0] != ' ') {
       // for byte bpe models
       std::ostringstream os;
       os << "<0x" << std::hex << std::uppercase << static_cast<uint8_t>(sym[0])