diff --git a/src/kit/taosdemo/taosdemo.c b/src/kit/taosdemo/taosdemo.c
index de6043f3cf37b4c6f7d02e004607baee50f0aef4..9449b229b459da0452747d5a13559419cf059c2d 100644
--- a/src/kit/taosdemo/taosdemo.c
+++ b/src/kit/taosdemo/taosdemo.c
@@ -296,7 +296,7 @@ typedef struct SSuperTable_S {
 
     char*        sampleDataBuf;
 #if STMT_IFACE_ENABLED == 1
-    void        *sampleBindArray;
+    char*        sampleBindArray;
 #endif
     //int          sampleRowCount;
     //int          sampleUsePos;
@@ -7309,7 +7309,7 @@ static int parseSampleFileToStmt(SSuperTable *stbInfo, uint32_t timePrec)
     stbInfo->sampleBindArray = calloc(1, sizeof(char *) * MAX_SAMPLES_ONCE_FROM_FILE);
     if (stbInfo->sampleBindArray == NULL) {
         errorPrint("%s() LN%d, Failed to allocate %"PRIu64" bind array buffer\n",
-                __func__, __LINE__, sizeof(char *) * MAX_SAMPLES_ONCE_FROM_FILE);
+                __func__, __LINE__, (uint64_t)sizeof(char *) * MAX_SAMPLES_ONCE_FROM_FILE);
         return -1;
     }