diff --git a/src/inc/sdb.h b/src/inc/sdb.h
index 389aecfb7b..a0e0a1b2f2 100644
--- a/src/inc/sdb.h
+++ b/src/inc/sdb.h
@@ -105,7 +105,7 @@ extern SSdbPeer *sdbPeer[];
 
 #endif
 
-void *sdbOpenTable(int maxRows, int32_t maxRowSize, char *name, char keyType, char *directory,
+void *sdbOpenTable(int maxRows, int32_t maxRowSize, char *name, uint8_t keyType, char *directory,
                    void *(*appTool)(char, void *, char *, int, int *));
 
 void *sdbGetRow(void *handle, void *key);
diff --git a/src/inc/taosmsg.h b/src/inc/taosmsg.h
index c1820a5b9c..d3634219aa 100644
--- a/src/inc/taosmsg.h
+++ b/src/inc/taosmsg.h
@@ -664,7 +664,7 @@ typedef struct {
   uint32_t destId;
   char     meterId[TSDB_UNI_LEN];
   char     empty[3];
-  char     msgType;
+  uint8_t  msgType;
   int32_t  msgLen;
   uint8_t  content[0];
 } SIntMsg;
diff --git a/src/sdb/inc/sdbint.h b/src/sdb/inc/sdbint.h
index 3327c1f731..c5b4f4e4ae 100644
--- a/src/sdb/inc/sdbint.h
+++ b/src/sdb/inc/sdbint.h
@@ -127,7 +127,7 @@ typedef struct {
 } SMnodeStatus;
 
 typedef struct {
-  char     dbId;
+  uint8_t  dbId;
   char     type;
   uint64_t version;
   short    dataLen;
diff --git a/src/sdb/src/sdbEngine.c b/src/sdb/src/sdbEngine.c
index c115f3c3c0..0efa81866f 100644
--- a/src/sdb/src/sdbEngine.c
+++ b/src/sdb/src/sdbEngine.c
@@ -287,7 +287,7 @@ sdb_exit1:
   return -1;
 }
 
-void *sdbOpenTable(int maxRows, int32_t maxRowSize, char *name, char keyType, char *directory,
+void *sdbOpenTable(int maxRows, int32_t maxRowSize, char *name, uint8_t keyType, char *directory,
                    void *(*appTool)(char, void *, char *, int, int *)) {
   SSdbTable *pTable = (SSdbTable *)malloc(sizeof(SSdbTable));
   if (pTable == NULL) return NULL;