diff --git a/src/ser.rs b/src/ser.rs
index 9b14389c8..4b8aea514 100644
--- a/src/ser.rs
+++ b/src/ser.rs
@@ -1947,7 +1947,7 @@ pub trait Formatter {
 }
 
 /// This structure compacts a JSON value with no extra whitespace.
-#[derive(Clone, Debug)]
+#[derive(Clone, Debug, Default)]
 pub struct CompactFormatter;
 
 impl Formatter for CompactFormatter {}