diff --git a/src/gadgets/biguint.rs b/src/gadgets/biguint.rs
index 2d7ed693..3aa96235 100644
--- a/src/gadgets/biguint.rs
+++ b/src/gadgets/biguint.rs
@@ -369,28 +369,4 @@ mod tests {
         let proof = data.prove(pw).unwrap();
         verify(proof, &data.verifier_only, &data.common)
     }
-
-    #[test]
-    fn test_biguint_sub() -> Result<()> {
-        let x_value = BigUint::from_u128(33333333333333333333333333333333333333).unwrap();
-        let y_value = BigUint::from_u128(22222222222222222222222222222222222222).unwrap();
-        let expected_z_value = &x_value - &y_value;
-
-        type F = CrandallField;
-        let config = CircuitConfig::large_config();
-        let pw = PartialWitness::new();
-        let mut builder = CircuitBuilder::<F, 4>::new(config);
-
-        let x = builder.constant_biguint(x_value);
-        let y = builder.constant_biguint(y_value);
-        let z = builder.sub_biguint(x, y);
-        let expected_z = builder.constant_biguint(expected_z_value);
-
-        builder.connect_biguint(z, expected_z);
-
-        let data = builder.build();
-        let proof = data.prove(pw).unwrap();
-
-        verify(proof, &data.verifier_only, &data.common)
-    }
 }
diff --git a/src/gadgets/nonnative.rs b/src/gadgets/nonnative.rs
index 10629ad9..7cae727d 100644
--- a/src/gadgets/nonnative.rs
+++ b/src/gadgets/nonnative.rs
@@ -158,7 +158,7 @@ mod tests {
 
     use crate::field::field_types::Field;
     use crate::field::goldilocks_field::GoldilocksField;
-    use crate::field::secp256k1::Secp256K1Base;
+    use crate::field::secp256k1_base::Secp256K1Base;
     use crate::iop::witness::PartialWitness;
     use crate::plonk::circuit_builder::CircuitBuilder;
     use crate::plonk::circuit_data::CircuitConfig;
@@ -267,8 +267,8 @@ mod tests {
         let x_ff = FF::rand();
         let inv_x_ff = x_ff.inverse();
 
-        type F = CrandallField;
-        let config = CircuitConfig::large_config();
+        type F = GoldilocksField;
+        let config = CircuitConfig::standard_recursion_config();
         let pw = PartialWitness::new();
         let mut builder = CircuitBuilder::<F, 4>::new(config);