diff --git a/ipc/tests/examples.rs b/ipc/tests/examples.rs
index 9d5eb37c4..d2fdd54d2 100644
--- a/ipc/tests/examples.rs
+++ b/ipc/tests/examples.rs
@@ -101,4 +101,24 @@ mod tests {
 
 		assert!(result.is_ok());
 	}
+
+	#[test]
+	fn can_use_custom_params() {
+		let mut socket = TestSocket::new();
+		socket.read_buffer = vec![1];
+		let service_client = ServiceClient::init(socket);
+
+		let result = service_client.push_custom(CustomData { a: 3, b: 11});
+
+		assert_eq!(vec![
+			// message num..
+			0, 18,
+			// payload length
+			0, 0, 0, 0, 0, 0, 0, 16,
+			// structure raw bytes (bigendians :( )
+			3, 0, 0, 0, 0, 0, 0, 0,
+			11, 0, 0, 0, 0, 0, 0, 0],
+			service_client.socket().borrow().write_buffer.clone());
+		assert_eq!(true, result);
+	}
 }
diff --git a/ipc/tests/service.rs.in b/ipc/tests/service.rs.in
index bb3c6fbba..6bfa72680 100644
--- a/ipc/tests/service.rs.in
+++ b/ipc/tests/service.rs.in
@@ -26,8 +26,8 @@ pub struct Service {
 }
 
 pub struct CustomData {
-	a: usize,
-	b: usize,
+	pub a: usize,
+	pub b: usize,
 }
 
 impl FromRawBytes for CustomData {
@@ -46,7 +46,7 @@ impl BytesConvertable for CustomData {
 		unsafe {
     		::std::slice::from_raw_parts(
         		ptr,
-        		::std::mem::size_of::<i64>()
+        		::std::mem::size_of::<CustomData>()
     		)
 		}
 	}