diff --git a/src/tsdb/src/tsdbFS.c b/src/tsdb/src/tsdbFS.c
index e8b39cef8d5926a2c1c3de24109625859c368ce9..8929ef6f0fa21bb5062d1d3cbfb7038a817df542 100644
--- a/src/tsdb/src/tsdbFS.c
+++ b/src/tsdb/src/tsdbFS.c
@@ -91,7 +91,7 @@ static int tsdbEncodeDFileSetArray(void **buf, SArray *pArray) {
 }
 
 static int tsdbDecodeDFileSetArray(void **originBuf, void *buf, SArray *pArray, SFSHeader *pSFSHeader) {
-  uint64_t  nset;
+  uint64_t  nset = 0;
   SDFileSet dset = {0};
   dset.ver = TSDB_FSET_VER_0;  // default value