diff --git a/bigquery/google/cloud/bigquery/dbapi/__init__.py b/bigquery/google/cloud/bigquery/dbapi/__init__.py
index 4e9c9a810da4..4786ef8ef5fa 100644
--- a/bigquery/google/cloud/bigquery/dbapi/__init__.py
+++ b/bigquery/google/cloud/bigquery/dbapi/__init__.py
@@ -55,8 +55,8 @@
 
 apilevel = '2.0'
 
-# Threads may share the module, but not connections.
-threadsafety = 1
+# Threads may share the module and connections, but not cursors.
+threadsafety = 2
 
 paramstyle = 'pyformat'