diff --git a/unikey/byteio.h b/unikey/byteio.h
index 7624a0b..9b3582d 100644
--- a/unikey/byteio.h
+++ b/unikey/byteio.h
@@ -16,7 +16,7 @@ typedef unsigned int UKDWORD;
 //----------------------------------------------------
 class ByteStream {
 public:
-    virtual ~ByteStream(){};
+    virtual ~ByteStream() {}
 };
 
 //----------------------------------------------------
diff --git a/unikey/charset.h b/unikey/charset.h
index 20a5534..f40d32b 100644
--- a/unikey/charset.h
+++ b/unikey/charset.h
@@ -70,8 +70,8 @@ const unsigned char PadEllipsis = '.';
 
 class DllInterface VnCharset {
 public:
-    virtual void startInput(){};
-    virtual void startOutput(){};
+    virtual void startInput() {}
+    virtual void startOutput() {}
     //	virtual UKBYTE *nextInput(UKBYTE *input, int inLen, StdVnChar & stdChar,
     // int & bytesRead) = 0;
     virtual int nextInput(ByteInStream &is, StdVnChar &stdChar,
@@ -106,7 +106,7 @@ class SingleByteCharset : public VnCharset {
 //--------------------------------------------------
 class VnInternalCharset : public VnCharset {
 public:
-    VnInternalCharset(){};
+    VnInternalCharset() {}
     virtual int nextInput(ByteInStream &is, StdVnChar &stdChar, int &bytesRead);
     virtual int putChar(ByteOutStream &os, StdVnChar stdChar, int &outLen);
     virtual int elementSize();