diff --git a/src/ffi.rs b/src/ffi.rs
index acbb1f1..d40d79b 100644
--- a/src/ffi.rs
+++ b/src/ffi.rs
@@ -422,6 +422,7 @@ pub fn nullifiers(args: i32, len: i32) -> i64 {
         for idx in 0..MAX_KEY {
             if vks[idx].owns(&note) {
                 nullifiers.push(note.gen_nullifier(&sks[idx]));
+                break;
             }
         }