diff --git a/superset/db_engine_specs.py b/superset/db_engine_specs.py
index 6700105a3f9f..2a2ba48861ab 100644
--- a/superset/db_engine_specs.py
+++ b/superset/db_engine_specs.py
@@ -1073,7 +1073,7 @@ class OracleEngineSpec(PostgresEngineSpec):
     @classmethod
     def convert_dttm(cls, target_type, dttm):
         return (
-            """TO_TIMESTAMP('{}', 'YYYY-MM-DD'T'HH24:MI:SS.ff6')"""
+            """TO_TIMESTAMP('{}', 'YYYY-MM-DD"T"HH24:MI:SS.ff6')"""
         ).format(dttm.isoformat())