diff --git a/dynamodb/filter.odin b/dynamodb/filter.odin
index 823bd23..67ce916 100644
--- a/dynamodb/filter.odin
+++ b/dynamodb/filter.odin
@@ -702,6 +702,12 @@ evaluate_filter :: proc(item: Item, node: ^Filter_Node) -> bool {
 evaluate_comparison :: proc(attr: Attribute_Value, op: Comparison_Op, val: Attribute_Value) -> bool {
 	cmp := compare_attribute_values(attr, val)
 
+	// -2 means types are incomparable - all comparisons return false
+	// (matches DynamoDB behavior: mixed-type comparisons always fail)
+	if cmp == -2 {
+		return false
+	}
+
 	switch op {
 	case .EQ: return cmp == 0
 	case .NE: return cmp != 0