diff --git a/src/secret.rs b/src/secret.rs
index 49323dd27..9fd43be30 100644
--- a/src/secret.rs
+++ b/src/secret.rs
@@ -28,7 +28,7 @@ macro_rules! impl_display_secret {
                 hasher.write(&self.secret_bytes());
                 let hash = hasher.finish();
 
-                f.debug_tuple(stringify!($thing)).field(&format_args!("#{:016x}", hash)).finish()
+                f.debug_tuple(stringify!($thing)).field(&format_args!("#{:.16x}", hash)).finish()
             }
         }