diff --git a/src/protocol/tests/utils.rs b/src/protocol/tests/utils.rs
index 6bed679520f0ac6a2d6f63cedaa64e30e99164b2..3cd2bd816cb7b230fff2b7daffde989300b5f3ea 100644
--- a/src/protocol/tests/utils.rs
+++ b/src/protocol/tests/utils.rs
@@ -592,6 +592,7 @@ impl<'a> FunctionTester<'a> {
                 );
             },
             Err(err) => {
+                println!("DEBUG: Formatted error:\n{}", err);
                 assert!(
                     false,
                     "[{}] Expected call to succeed, but got {:?} for {}",