diff --git a/src/tsdb/src/tsdbFS.c b/src/tsdb/src/tsdbFS.c
index cc7e20fb755de31299ea2d744d296edc4512b67e..297a7ce6f13fccf12f080728bebc34354a09b533 100644
--- a/src/tsdb/src/tsdbFS.c
+++ b/src/tsdb/src/tsdbFS.c
@@ -112,7 +112,6 @@ static int tsdbDecodeDFileSetArray(void **originBuf, void *buf, SArray *pArray,
 
   for (size_t i = 0; i < nset; i++) {
     SDFileSet dset = {0}; // ver is TSDB_FSET_VER_0(0) at default
-    int a = sizeof(dset);
     buf = tsdbDecodeDFileSet(buf, &dset, pSFSHeader->version);
     taosArrayPush(pArray, (void *)(&dset));
   }