diff --git a/src/client/src/tscSub.c b/src/client/src/tscSub.c
index e44f88189fb5..b3d18f50114c 100644
--- a/src/client/src/tscSub.c
+++ b/src/client/src/tscSub.c
@@ -149,7 +149,6 @@ static SSub* tscCreateSubscription(STscObj* pObj, const char* topic, const char*
     goto fail;
   }
 
-  strtolower(pSql->sqlstr, pSql->sqlstr);
   pRes->qId = 0;
   pRes->numOfRows = 1;
   pCmd->resColumnId = TSDB_RES_COL_ID;
diff --git a/tests/pytest/subscribe/singlemeter.py b/tests/pytest/subscribe/singlemeter.py
index 879e0a75ebdf..ff182f70b572 100644
--- a/tests/pytest/subscribe/singlemeter.py
+++ b/tests/pytest/subscribe/singlemeter.py
@@ -68,8 +68,24 @@ def run(self):
 		tdSub.consume()
 		tdSub.checkRows(11)
 
+
+		# TS-1788: Subscribe a case sensitive table		
+		tdLog.info("create a table and insert 10 rows.")
+		tdSql.execute("create table `T1`(ts timestamp, a int, b int);")
+		for i in range(0, 10):
+			tdSql.execute("insert into `T1` values (%d, %d, %d);" % (now + i, i, i))
+		
+		sqlstr = "select * from `T1`"
+		topic = "topic1"
+		now = int(time.time() * 1000)
+		
+		tdSub.init(self.conn.subscribe(True, topic, sqlstr, 0))
+		tdSub.consume()
+		tdSub.checkRows(10)
+		
 		tdSub.close(True)
 
+
 	def stop(self):
 		tdSub.close(False)
 		tdSql.close()