diff --git a/src/main.rs b/src/main.rs
index 0f09f6e1..9d222bd7 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -113,7 +113,7 @@ pub fn list_languages(config: &Config) -> Result<()> {
 
     if config.loop_through {
         for lang in languages {
-            write!(stdout, "{}:{}\n", lang.name, lang.file_extensions.join(","));
+            write!(stdout, "{}:{}\n", lang.name, lang.file_extensions.join(","))?;
         }
     } else {
         let longest = languages