diff --git a/src/groth16/tests/dummy_engine.rs b/src/groth16/tests/dummy_engine.rs
index 8f11fe1..c4a7ca9 100644
--- a/src/groth16/tests/dummy_engine.rs
+++ b/src/groth16/tests/dummy_engine.rs
@@ -399,7 +399,7 @@ impl PrimeGroup for Fr {}
 impl CofactorGroup for Fr {
     type Subgroup = Fr;
 
-    fn mul_by_cofactor(&self) -> Self::Subgroup {
+    fn clear_cofactor(&self) -> Self::Subgroup {
         *self
     }