diff --git a/tarpc/src/macros.rs b/tarpc/src/macros.rs
index 4670030..53fbde0 100644
--- a/tarpc/src/macros.rs
+++ b/tarpc/src/macros.rs
@@ -355,6 +355,9 @@ mod test {
         mod baz {
             items {
                 use std::collections::HashMap;
+
+                #[derive(Debug)]
+                pub struct Debuggable;
             }
 
             service {
@@ -364,4 +367,9 @@ mod test {
             }
         }
     }
+
+    #[test]
+    fn debug() {
+        println!("{:?}", baz::Debuggable);
+    }
 }