diff --git a/mers_lib/Cargo.toml b/mers_lib/Cargo.toml
index 8724d14..da0c58d 100755
--- a/mers_lib/Cargo.toml
+++ b/mers_lib/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "mers_lib"
-version = "0.8.21"
+version = "0.8.22"
 edition = "2021"
 license = "MIT OR Apache-2.0"
 description = "library to use the mers language in other projects"
diff --git a/mers_lib/src/pretty_print.rs b/mers_lib/src/pretty_print.rs
index 52c59aa..337176b 100644
--- a/mers_lib/src/pretty_print.rs
+++ b/mers_lib/src/pretty_print.rs
@@ -23,6 +23,7 @@ pub fn pretty_print_to<O: Write>(
     let srca = Arc::new(src.clone());
     let parsed = parse(&mut src, &srca)?;
     print_parsed(&srca, parsed.as_ref(), out, theme);
+    Ok(())
 }
 
 pub enum AbstractColor {