diff --git a/.mypy.ini b/.mypy.ini
index f34957197..ef34dbada 100644
--- a/.mypy.ini
+++ b/.mypy.ini
@@ -265,9 +265,6 @@ disallow_untyped_defs = False
 [mypy-qutebrowser.misc.split]
 disallow_untyped_defs = False
 
-[mypy-qutebrowser.misc.sql]
-disallow_untyped_defs = False
-
 [mypy-qutebrowser.qutebrowser]
 disallow_untyped_defs = False
 
diff --git a/qutebrowser/misc/sql.py b/qutebrowser/misc/sql.py
index 28a97fd77..c2f27db26 100644
--- a/qutebrowser/misc/sql.py
+++ b/qutebrowser/misc/sql.py
@@ -349,7 +349,7 @@ class Query:
             msg = f'Failed to {step} query "{query}": "{error.text()}"'
             raise_sqlite_error(msg, error)
 
-    def _validate_bound_values(self):
+    def _validate_bound_values(self) -> None:
         """Make sure all placeholders are bound."""
         qt_bound_values = self.query.boundValues()
         if machinery.IS_QT5: