diff --git a/src/circom/builder.rs b/src/circom/builder.rs
index 9dc0e8c..533aaa3 100644
--- a/src/circom/builder.rs
+++ b/src/circom/builder.rs
@@ -1,6 +1,6 @@
 use ark_ff::PrimeField;
 use num_bigint::BigInt;
-use std::{collections::HashMap, fs::File, io::BufReader, path::Path};
+use std::{collections::HashMap, fs::File, io::{BufReader, Cursor}, path::Path};
 use wasmer::Store;
 
 use super::{CircomCircuit, R1CS};
@@ -53,12 +53,14 @@ impl<F: PrimeField> CircomConfig<F> {
         })
     }
 
-    pub fn from_bytes(wtns: &[u8], r1cs: &[u8]) -> Result<Self> {
-        let wtns = WitnessCalculator::from_bytes(wtns).unwrap();
+    pub fn new_from_bytes(wtns: &[u8], r1cs: &[u8]) -> Result<Self> {
+        let mut store = Store::default();
+        let wtns = WitnessCalculator::from_bytes(&mut store, wtns).unwrap();
         let r1cs = R1CSFile::new(Cursor::new(r1cs))?.into();
         Ok(Self {
             wtns,
             r1cs,
+            store,
             sanity_check: false,
         })
     }
diff --git a/src/witness/witness_calculator.rs b/src/witness/witness_calculator.rs
index c9e1888..f058031 100644
--- a/src/witness/witness_calculator.rs
+++ b/src/witness/witness_calculator.rs
@@ -55,6 +55,11 @@ impl WitnessCalculator {
         Self::from_module(store, module)
     }
 
+    pub fn from_file(store: &mut Store, path: impl AsRef<std::path::Path>) -> Result<Self> {
+        let module = Module::new(&store, bytes)?;
+        Self::from_module(store, module)
+    }
+
     pub fn from_file(store: &mut Store, path: impl AsRef<std::path::Path>) -> Result<Self> {
         let module = Module::from_file(&store, path)?;
         Self::from_module(store, module)