diff --git a/src/groth16/tests/dummy_engine.rs b/src/groth16/tests/dummy_engine.rs
index c4a7ca9..4a3d6da 100644
--- a/src/groth16/tests/dummy_engine.rs
+++ b/src/groth16/tests/dummy_engine.rs
@@ -417,10 +417,6 @@ impl Curve for Fr {
 }
 
 impl WnafGroup for Fr {
-    fn recommended_wnaf_for_scalar(_: &Self::Scalar) -> usize {
-        3
-    }
-
     fn recommended_wnaf_for_num_scalars(_: usize) -> usize {
         3
     }