diff --git a/roaring/roaring.go b/roaring/roaring.go
index 8930981e0..5437bba83 100644
--- a/roaring/roaring.go
+++ b/roaring/roaring.go
@@ -3963,6 +3963,9 @@ func (op *op) UnmarshalBinary(data []byte) error {
 	_, _ = h.Write(data[0:9])
 
 	if op.typ > 1 {
+		if 1152921504606847000 < int(op.value) {
+			return fmt.Errorf("too big")
+		}
 		if len(data) < int(13+op.value*8) {
 			return fmt.Errorf("op data truncated - expected %d, got %d", 13+op.value*8, len(data))
 		}