diff --git a/waku-bindings/src/macros.rs b/waku-bindings/src/macros.rs
index 4959638..4ad9608 100644
--- a/waku-bindings/src/macros.rs
+++ b/waku-bindings/src/macros.rs
@@ -52,9 +52,9 @@ macro_rules! handle_ffi_call {
             notify_clone.notify_one();
         };
 
+        let mut closure = result_cb;
         // Create trampoline and invoke the `waku_sys` function
         let code = unsafe {
-            let mut closure = result_cb;
             let cb = get_trampoline(&closure);
             $waku_fn(
                 $ctx,           // Pass the context
diff --git a/waku-bindings/src/node/management.rs b/waku-bindings/src/node/management.rs
index cad28f4..fc01c38 100644
--- a/waku-bindings/src/node/management.rs
+++ b/waku-bindings/src/node/management.rs
@@ -33,8 +33,8 @@ pub async fn waku_new(config: Option<WakuNodeConfig>) -> Result<WakuNodeContext>
         result = r;
         notify_clone.notify_one(); // Notify that the value has been updated
     };
+    let mut closure = result_cb;
     let obj_ptr = unsafe {
-        let mut closure = result_cb;
         let cb = get_trampoline(&closure);
         waku_sys::waku_new(config_ptr, cb, &mut closure as *mut _ as *mut c_void)
     };