diff --git a/src/lib.rs b/src/lib.rs
index 21753f0..645e5bc 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -24,10 +24,10 @@ pub fn x25519_keygen(keyid: &mut SharedPtr, pk: &mut SharedPtr) {
     }
 }
 
-pub fn x25519(out: &mut SharedPtr, pk: &SharedPtr, sk: &SharedPtr) {
+pub fn x25519(out: &mut SharedPtr, sk: &SharedPtr, pk: &SharedPtr) {
     let mut agent = AGENT.lock().unwrap();
 
     unsafe {
-        agent.perform_ipc_call(1, &[out.get_offset(), pk.get_offset(), sk.get_offset()]);
+        agent.perform_ipc_call(1, &[out.get_offset(), sk.get_offset(), pk.get_offset()]);
     }
 }