diff --git a/redash/query_runner/pg.py b/redash/query_runner/pg.py
index 7289b8355c..e00e879984 100644
--- a/redash/query_runner/pg.py
+++ b/redash/query_runner/pg.py
@@ -186,7 +186,7 @@ def _get_connection(self):
                                       host=self.configuration.get('host'),
                                       port=self.configuration.get('port'),
                                       dbname=self.configuration.get('dbname'),
-                                      sslmode='require',
+                                      sslmode='prefer',
                                       sslrootcert=sslrootcert_path,
                                       async=True)