diff --git a/source/client/src/TMQConnector.c b/source/client/src/TMQConnector.c
index 3755a591e3191d725b53741c34606fca418fb4c6..b000dd6a3286c6f7f1a5d127a325eb8c404b2418 100644
--- a/source/client/src/TMQConnector.c
+++ b/source/client/src/TMQConnector.c
@@ -322,7 +322,7 @@ JNIEXPORT jint JNICALL Java_com_taosdata_jdbc_tmq_TMQConnector_fetchRawBlockImp(
   (*env)->CallVoidMethod(env, rowobj, g_blockdataSetNumOfRowsFp, (jint)numOfRows);
   (*env)->CallVoidMethod(env, rowobj, g_blockdataSetNumOfColsFp, (jint)numOfFields);
 
-  int32_t len = *(int32_t *)data;
+  int32_t len = *(int32_t *)(data + 4);
   (*env)->CallVoidMethod(env, rowobj, g_blockdataSetByteArrayFp, jniFromNCharToByteArray(env, (char *)data, len));
   return JNI_SUCCESS;
 }
diff --git a/source/client/src/TSDBJNIConnector.c b/source/client/src/TSDBJNIConnector.c
index 37041da6950999f798a0064b1f18200a946b2d43..e027066d10c5840524a0abe8423591ad5ce18490 100644
--- a/source/client/src/TSDBJNIConnector.c
+++ b/source/client/src/TSDBJNIConnector.c
@@ -592,7 +592,7 @@ JNIEXPORT jint JNICALL Java_com_taosdata_jdbc_TSDBJNIConnector_fetchBlockImp(JNI
   (*env)->CallVoidMethod(env, rowobj, g_blockdataSetNumOfRowsFp, (jint)numOfRows);
   (*env)->CallVoidMethod(env, rowobj, g_blockdataSetNumOfColsFp, (jint)numOfFields);
 
-  int32_t len = *(int32_t *)data;
+  int32_t len = *(int32_t *)(data + 4);
   (*env)->CallVoidMethod(env, rowobj, g_blockdataSetByteArrayFp, jniFromNCharToByteArray(env, (char *)data, len));
 
   return JNI_SUCCESS;