diff --git a/src/client/src/tscGlobalmerge.c b/src/client/src/tscGlobalmerge.c
index 6b918745bffe62c08da5fb6082a7669e947ee823..d7a4b0d96d20ba32296c4de06030c3bc89c63e89 100644
--- a/src/client/src/tscGlobalmerge.c
+++ b/src/client/src/tscGlobalmerge.c
@@ -1016,7 +1016,7 @@ static void ensureOutputBuf(SSLimitOperatorInfo * pInfo, SSDataBlock *pResultBlo
       }
 
       pInfo->capacity  = total;
-      pInfo->threshold = total * 0.8;
+      pInfo->threshold = (int64_t) (total * 0.8);
     }
   }
 }