diff --git a/algebraic/src/witness/witness_calculator.rs b/algebraic/src/witness/witness_calculator.rs
index 0faa1da3..465f4310 100644
--- a/algebraic/src/witness/witness_calculator.rs
+++ b/algebraic/src/witness/witness_calculator.rs
@@ -87,16 +87,7 @@ impl WitnessCalculator {
                 "writeBufferMessage" => runtime::write_buffer_message(&mut store),
             }
         };
-        let instance = Wasm::new(Instance::new(&mut scope, &module, &import_object)?);
-        let mut store = Store::default();
-        let env = FunctionEnv::new(&mut store, ());
-        let module = Module::new(&store, "(module)")?;
-        let imports = imports! {
-          "host" => {
-            "var" => Global::new(&mut store, Value::I32(2))
-          }
-        };
-        let instance = Instance::new(&mut store, &module, &imports)?;
+        let instance = Wasm::new(Instance::new(&mut store, &module, &import_object)?);
 
         // Circom 2 feature flag with version 2
         fn new_circom(instance: Wasm, memory: Memory) -> Result<WitnessCalculator> {
diff --git a/groth16/Cargo.toml b/groth16/Cargo.toml
index d8ac1fe3..6f9c2671 100644
--- a/groth16/Cargo.toml
+++ b/groth16/Cargo.toml
@@ -22,6 +22,7 @@ thiserror="1.0"
 fnv = { version = "1.0.3", default-features = false }
 num = { version = "0.4.0" }
 algebraic = { path = "../algebraic", default-features=false }
+rand = "0.4"
 
 [dev-dependencies]
 env_logger = "0.10"
diff --git a/plonky/Cargo.toml b/plonky/Cargo.toml
index 00e59e6a..bd61a228 100644
--- a/plonky/Cargo.toml
+++ b/plonky/Cargo.toml
@@ -35,6 +35,7 @@ thiserror="1.0"
 fnv = { version = "1.0.3", default-features = false }
 num = { version = "0.4.0" }
 algebraic = { path = "../algebraic", default-features=false }
+rand = "0.4"
 
 [dev-dependencies]
 env_logger = "0.10"