diff --git a/source/common/src/ttime.c b/source/common/src/ttime.c
index 77b45b6df1bb861375986e946b0e24680c11cfdc..60145f3ad4c34c183ebfa301ccc7d818e28bb443 100644
--- a/source/common/src/ttime.c
+++ b/source/common/src/ttime.c
@@ -679,7 +679,7 @@ int32_t parseNatualDuration(const char* token, int32_t tokenLen, int64_t* durati
 
   *unit = token[tokenLen - 1];
   if (*unit == 'n' || *unit == 'y') {
-    return 0;
+    return -1;
   }
 
   return getDuration(*duration, *unit, duration, timePrecision);