diff --git a/r2/r2/lib/db/operators.py b/r2/r2/lib/db/operators.py
index 652249fa7..84137ceda 100644
--- a/r2/r2/lib/db/operators.py
+++ b/r2/r2/lib/db/operators.py
@@ -29,6 +29,7 @@ class BooleanOp(object):
 
 class or_(BooleanOp): pass
 class and_(BooleanOp): pass
+class not_(BooleanOp): pass
 
 class op(object):
     def __init__(self, lval, lval_name, rval):
diff --git a/r2/r2/lib/db/tdb_sql.py b/r2/r2/lib/db/tdb_sql.py
index 09661212f..491072cc8 100644
--- a/r2/r2/lib/db/tdb_sql.py
+++ b/r2/r2/lib/db/tdb_sql.py
@@ -710,6 +710,8 @@ def sa_op(op):
         return sa.or_(*[sa_op(o) for o in op.ops])
     elif isinstance(op, operators.and_):
         return sa.and_(*[sa_op(o) for o in op.ops])
+    elif isinstance(op, operators.not_):
+        return sa.not_(*[sa_op(o) for o in op.ops])
 
     #else, assume op is an instance of op
     if isinstance(op, operators.eq):