diff --git a/rslib/backend.proto b/rslib/backend.proto
index cdb8b27cd..0a1b5d2d7 100644
--- a/rslib/backend.proto
+++ b/rslib/backend.proto
@@ -824,6 +824,7 @@ message SearchTerm {
     CardState card_state = 12;
     IdList nids = 13;
     uint32 edited_in_days = 14;
+    SearchTerm negated = 15;
   }
 }
 
diff --git a/rslib/src/backend/mod.rs b/rslib/src/backend/mod.rs
index b80b16868..ccb88b846 100644
--- a/rslib/src/backend/mod.rs
+++ b/rslib/src/backend/mod.rs
@@ -354,6 +354,7 @@ impl From<pb::SearchTerm> for Node<'_> {
                     Flag::Green => Node::Search(SearchNode::Flag(3)),
                     Flag::Blue => Node::Search(SearchNode::Flag(4)),
                 },
+                Filter::Negated(term) => Node::Not(Box::new((*term).into())),
             }
         } else {
             Node::Search(SearchNode::WholeCollection)