diff --git a/zokrates_js/src/lib.rs b/zokrates_js/src/lib.rs
index 07082c3e..c776f34b 100644
--- a/zokrates_js/src/lib.rs
+++ b/zokrates_js/src/lib.rs
@@ -471,7 +471,8 @@ pub fn compute_witness(
     config: JsValue,
     log_callback: &js_sys::Function,
 ) -> Result<ComputationResult, JsValue> {
-    let prog = ir::ProgEnum::deserialize(program)
+    let cursor = Cursor::new(program);
+    let prog = ir::ProgEnum::deserialize(cursor)
         .map_err(|err| JsValue::from_str(&err))?
         .collect();
     match prog {
@@ -533,7 +534,8 @@ pub fn setup(program: &[u8], options: JsValue) -> Result<JsValue, JsValue> {
     )
     .map_err(|e| JsValue::from_str(&e))?;
 
-    let prog = ir::ProgEnum::deserialize(program)
+    let cursor = Cursor::new(program);
+    let prog = ir::ProgEnum::deserialize(cursor)
         .map_err(|err| JsValue::from_str(&err))?
         .collect();
 
@@ -572,7 +574,8 @@ pub fn setup_with_srs(srs: &[u8], program: &[u8], options: JsValue) -> Result<Js
     )
     .map_err(|e| JsValue::from_str(&e))?;
 
-    let prog = ir::ProgEnum::deserialize(program)
+    let cursor = Cursor::new(program);
+    let prog = ir::ProgEnum::deserialize(cursor)
         .map_err(|err| JsValue::from_str(&err))?
         .collect();
 
@@ -635,7 +638,8 @@ pub fn generate_proof(
     )
     .map_err(|e| JsValue::from_str(&e))?;
 
-    let prog = ir::ProgEnum::deserialize(program)
+    let cursor = Cursor::new(program);
+    let prog = ir::ProgEnum::deserialize(cursor)
         .map_err(|err| JsValue::from_str(&err))?
         .collect();