diff --git a/source/dnode/vnode/src/tsdb/dev/tsdbCommit.c b/source/dnode/vnode/src/tsdb/dev/tsdbCommit.c
index a5c319e2c47d0cf7d2c88dcdc4e999c05081da84..68b53c48d9048209517f3675af16f627491d3ba5 100644
--- a/source/dnode/vnode/src/tsdb/dev/tsdbCommit.c
+++ b/source/dnode/vnode/src/tsdb/dev/tsdbCommit.c
@@ -33,7 +33,7 @@ typedef struct {
   TSKEY   minKey;
   TSKEY   maxKey;
   // writer
-  SSttFWriter *pWriter;
+  struct SSttFWriter *pWriter;
 } SCommitter;
 
 static int32_t tsdbCommitOpenWriter(SCommitter *pCommitter) {
diff --git a/source/dnode/vnode/src/tsdb/dev/tsdbSttFWriter.c b/source/dnode/vnode/src/tsdb/dev/tsdbSttFWriter.c
index 43cb39efb062619b5fe38fb010bf00ad26f5aa6f..815b783bd9fd0a2818bec660ce88c5c767ebbb47 100644
--- a/source/dnode/vnode/src/tsdb/dev/tsdbSttFWriter.c
+++ b/source/dnode/vnode/src/tsdb/dev/tsdbSttFWriter.c
@@ -22,7 +22,7 @@ extern int32_t tsdbReadFile(STsdbFD *pFD, int64_t offset, uint8_t *pBuf, int64_t
 extern int32_t tsdbFsyncFile(STsdbFD *pFD);
 
 struct SSttFWriter {
-  SSttFWriterConf config;
+  struct SSttFWriterConf config;
   // time-series data
   SBlockData bData;
   SArray    *aSttBlk;  // SArray<SSttBlk>
@@ -35,7 +35,7 @@ struct SSttFWriter {
   STsdbFD *pFd;
 };
 
-static int32_t write_ts_block(SSttFWriter *pWriter) {
+static int32_t write_ts_block(struct SSttFWriter *pWriter) {
   int32_t code = 0;
   int32_t lino;
 
@@ -73,28 +73,28 @@ _exit:
   return code;
 }
 
-static int32_t write_del_block(SSttFWriter *pWriter) {
+static int32_t write_del_block(struct SSttFWriter *pWriter) {
   int32_t code = 0;
   // TODO
   return code;
 }
 
-static int32_t write_stt_blk(SSttFWriter *pWriter) {
+static int32_t write_stt_blk(struct SSttFWriter *pWriter) {
   int32_t code = 0;
   // TODO
   return code;
 }
 
-static int32_t write_del_blk(SSttFWriter *pWriter) {
+static int32_t write_del_blk(struct SSttFWriter *pWriter) {
   int32_t code = 0;
   // TODO
   return code;
 }
 
-static int32_t stt_fwriter_create(const SSttFWriterConf *pConf, SSttFWriter **ppWriter) {
+static int32_t stt_fwriter_create(const struct SSttFWriterConf *pConf, struct SSttFWriter **ppWriter) {
   int32_t code = 0;
 
-  if ((ppWriter[0] = taosMemoryCalloc(1, sizeof(SSttFWriter))) == NULL) {
+  if ((ppWriter[0] = taosMemoryCalloc(1, sizeof(*ppWriter[0]))) == NULL) {
     code = TSDB_CODE_OUT_OF_MEMORY;
     goto _exit;
   }
@@ -124,7 +124,7 @@ _exit:
   return code;
 }
 
-static int32_t stt_fwriter_destroy(SSttFWriter *pWriter) {
+static int32_t stt_fwriter_destroy(struct SSttFWriter *pWriter) {
   if (pWriter) {
     tDestroyTSchema(pWriter->skmTb.pTSchema);
     tDestroyTSchema(pWriter->skmRow.pTSchema);
@@ -135,19 +135,19 @@ static int32_t stt_fwriter_destroy(SSttFWriter *pWriter) {
   return 0;
 }
 
-static int32_t stt_fwriter_open(SSttFWriter *pWriter) {
+static int32_t stt_fwriter_open(struct SSttFWriter *pWriter) {
   int32_t code = 0;
   // TODO
   return code;
 }
 
-static int32_t stt_fwriter_close(SSttFWriter *pWriter) {
+static int32_t stt_fwriter_close(struct SSttFWriter *pWriter) {
   int32_t code = 0;
   // TODO
   return code;
 }
 
-int32_t tsdbSttFWriterOpen(const SSttFWriterConf *pConf, SSttFWriter **ppWriter) {
+int32_t tsdbSttFWriterOpen(const struct SSttFWriterConf *pConf, struct SSttFWriter **ppWriter) {
   int32_t code = 0;
   int32_t lino;
 
@@ -168,7 +168,7 @@ _exit:
   return code;
 }
 
-int32_t tsdbSttFWriterClose(SSttFWriter **ppWriter) {
+int32_t tsdbSttFWriterClose(struct SSttFWriter **ppWriter) {
   int32_t vgId = TD_VID(ppWriter[0]->config.pTsdb->pVnode);
   int32_t code = 0;
   int32_t lino;
@@ -185,7 +185,7 @@ _exit:
   return code;
 }
 
-int32_t tsdbSttFWriteTSData(SSttFWriter *pWriter, TABLEID *tbid, TSDBROW *pRow) {
+int32_t tsdbSttFWriteTSData(struct SSttFWriter *pWriter, TABLEID *tbid, TSDBROW *pRow) {
   int32_t code = 0;
   int32_t lino;
 
@@ -225,7 +225,7 @@ _exit:
   return code;
 }
 
-int32_t tsdbSttFWriteDLData(SSttFWriter *pWriter, TABLEID *tbid, SDelData *pDelData) {
+int32_t tsdbSttFWriteDLData(struct SSttFWriter *pWriter, TABLEID *tbid, SDelData *pDelData) {
   int32_t code = 0;
   // TODO
   return code;
diff --git a/source/dnode/vnode/src/tsdb/dev/tsdbSttFWriter.h b/source/dnode/vnode/src/tsdb/dev/tsdbSttFWriter.h
index 3a1b28a560fab7270837c2435ae83f3ee2b96669..59280a0baa6b6cbeb7d4046796fd9f994a863177 100644
--- a/source/dnode/vnode/src/tsdb/dev/tsdbSttFWriter.h
+++ b/source/dnode/vnode/src/tsdb/dev/tsdbSttFWriter.h
@@ -22,13 +22,13 @@
 extern "C" {
 #endif
 
-typedef struct SSttFWriter     SSttFWriter;
-typedef struct SSttFWriterConf SSttFWriterConf;
+struct SSttFWriter;
+struct SSttFWriterConf;
 
-int32_t tsdbSttFWriterOpen(const SSttFWriterConf *pConf, SSttFWriter **ppWriter);
-int32_t tsdbSttFWriterClose(SSttFWriter **ppWriter);
-int32_t tsdbSttFWriteTSData(SSttFWriter *pWriter, TABLEID *tbid, TSDBROW *pRow);
-int32_t tsdbSttFWriteDLData(SSttFWriter *pWriter, TABLEID *tbid, SDelData *pDelData);
+int32_t tsdbSttFWriterOpen(const struct SSttFWriterConf *pConf, struct SSttFWriter **ppWriter);
+int32_t tsdbSttFWriterClose(struct SSttFWriter **ppWriter);
+int32_t tsdbSttFWriteTSData(struct SSttFWriter *pWriter, TABLEID *tbid, TSDBROW *pRow);
+int32_t tsdbSttFWriteDLData(struct SSttFWriter *pWriter, TABLEID *tbid, SDelData *pDelData);
 
 struct SSttFWriterConf {
   STsdb    *pTsdb;