diff --git a/src/argparse.rs b/src/argparse.rs
index e4ca0edb..f5c50211 100644
--- a/src/argparse.rs
+++ b/src/argparse.rs
@@ -197,7 +197,7 @@ macro_rules! py_argparse_parse_plist_impl {
     // TT muncher macro that does the main work for py_argparse_parse_plist!.
 
     // Base case: all parameters handled
-    { $callback:ident { $($initial_arg:tt)* } $output:tt ( ) } => {
+    { $callback:ident { $($initial_arg:tt)* } $output:tt ( $(,)? ) } => {
         $crate::$callback! { $($initial_arg)* $output }
     };
     // Kwargs parameter with reference extraction
diff --git a/tests/test_function.rs b/tests/test_function.rs
index ab39b6e3..35df0a88 100644
--- a/tests/test_function.rs
+++ b/tests/test_function.rs
@@ -80,6 +80,32 @@ fn one_arg() {
     assert!(obj.call(py, NoArgs, Some(&dict)).is_err());
 }
 
+#[test]
+fn trailing_comma() {
+    fn f(_py: Python, i: usize, j: usize) -> PyResult<usize> {
+        Ok(i + j)
+    }
+
+    let gil = Python::acquire_gil();
+    let py = gil.python();
+    // Define a function where the parameters are on separate
+    // lines with trailing commas.
+    let obj = py_fn!(
+        py,
+        f(
+            first_parameter_with_long_name: usize,
+            second_parameter_with_long_name: usize,
+        )
+    );
+    assert_eq!(
+        obj.call(py, (1, 1), None)
+            .unwrap()
+            .extract::<i32>(py)
+            .unwrap(),
+        2
+    );
+}
+
 #[test]
 fn inline_two_args() {
     let gil = Python::acquire_gil();