diff --git a/CPP/7zip/Compress/BrotliDecoder.h b/CPP/7zip/Compress/BrotliDecoder.h
index 7ab6f933..31a5e3e8 100644
--- a/CPP/7zip/Compress/BrotliDecoder.h
+++ b/CPP/7zip/Compress/BrotliDecoder.h
@@ -20,8 +20,6 @@ struct BrotliStream {
   ICompressProgressInfo *progress;
   UInt64 *processedIn;
   UInt64 *processedOut;
-  CCriticalSection *cs;
-  int flags;
 };
 
 extern int BrotliRead(void *Stream, BROTLIMT_Buffer * in);
@@ -54,7 +52,6 @@ class CDecoder:public ICompressCoder,
   CMyComPtr < ISequentialInStream > _inStream;
 
   DProps _props;
-  CCriticalSection cs;
 
   UInt64 _processedIn;
   UInt64 _processedOut;
diff --git a/CPP/7zip/Compress/LizardDecoder.h b/CPP/7zip/Compress/LizardDecoder.h
index ae6efdc5..b0bfce06 100644
--- a/CPP/7zip/Compress/LizardDecoder.h
+++ b/CPP/7zip/Compress/LizardDecoder.h
@@ -22,8 +22,6 @@ struct LizardStream {
   ICompressProgressInfo *progress;
   UInt64 *processedIn;
   UInt64 *processedOut;
-  CCriticalSection *cs;
-  int flags;
 };
 
 extern int LizardRead(void *Stream, LIZARDMT_Buffer * in);
@@ -56,7 +54,6 @@ class CDecoder:public ICompressCoder,
   CMyComPtr < ISequentialInStream > _inStream;
 
   DProps _props;
-  CCriticalSection cs;
 
   UInt64 _processedIn;
   UInt64 _processedOut;
diff --git a/CPP/7zip/Compress/Lz4Decoder.h b/CPP/7zip/Compress/Lz4Decoder.h
index 484b924c..8e4c3193 100644
--- a/CPP/7zip/Compress/Lz4Decoder.h
+++ b/CPP/7zip/Compress/Lz4Decoder.h
@@ -20,8 +20,6 @@ struct Lz4Stream {
   ICompressProgressInfo *progress;
   UInt64 *processedIn;
   UInt64 *processedOut;
-  CCriticalSection *cs;
-  int flags;
 };
 
 extern int Lz4Read(void *Stream, LZ4MT_Buffer * in);
@@ -55,7 +53,6 @@ class CDecoder:public ICompressCoder,
   CMyComPtr < ISequentialInStream > _inStream;
 
   DProps _props;
-  CCriticalSection cs;
 
   UInt64 _processedIn;
   UInt64 _processedOut;
diff --git a/CPP/7zip/Compress/Lz5Decoder.h b/CPP/7zip/Compress/Lz5Decoder.h
index 3574fffe..ef284ec4 100644
--- a/CPP/7zip/Compress/Lz5Decoder.h
+++ b/CPP/7zip/Compress/Lz5Decoder.h
@@ -20,8 +20,6 @@ struct Lz5Stream {
   ICompressProgressInfo *progress;
   UInt64 *processedIn;
   UInt64 *processedOut;
-  CCriticalSection *cs;
-  int flags;
 };
 
 extern int Lz5Read(void *Stream, LZ5MT_Buffer * in);
@@ -55,7 +53,6 @@ class CDecoder:public ICompressCoder,
   CMyComPtr < ISequentialInStream > _inStream;
 
   DProps _props;
-  CCriticalSection cs;
 
   UInt64 _processedIn;
   UInt64 _processedOut;