diff --git a/src/tsdb/src/tsdbCommit.c b/src/tsdb/src/tsdbCommit.c
index dd0fd1801940e386c9246ee0a04ff1d5c8b9e14a..4351cce51c09f86fc06cee59c94b800c44e60b1c 100644
--- a/src/tsdb/src/tsdbCommit.c
+++ b/src/tsdb/src/tsdbCommit.c
@@ -17,7 +17,7 @@
 #define TSDB_MAX_SUBBLOCKS 8
 static FORCE_INLINE int TSDB_KEY_FID(TSKEY key, int32_t days, int8_t precision) {
   if (key < 0) {
-    return (int)((key + 1) / tsMsPerDay[precision] / days + 1);
+    return (int)((key + 1) / tsMsPerDay[precision] / days - 1);
   } else {
     return (int)((key / tsMsPerDay[precision] / days));
   }