diff --git a/src/headers/error.rs b/src/headers/error.rs
index d5153f8..4a7fcf1 100644
--- a/src/headers/error.rs
+++ b/src/headers/error.rs
@@ -9,8 +9,8 @@ pub enum BlockHeaderError {
     JsonError(#[from] serde_json::Error),
     #[error("Invalid input")]
     InvalidInput,
-    #[error("Mismatched roots: expected {0:?}, got {1:?}")]
-    MismatchedRoots(BlockHeaderRoots, BlockHeaderRoots),
+    #[error("Mismatched roots")]
+    MismatchedRoots(Box<(BlockHeaderRoots, BlockHeaderRoots)>),
     #[error("Missing header")]
     MissingHeader,
     #[error("Invalid total difficulty")]
diff --git a/src/headers/mod.rs b/src/headers/mod.rs
index 927c28b..ac90601 100644
--- a/src/headers/mod.rs
+++ b/src/headers/mod.rs
@@ -39,10 +39,10 @@ pub fn check_valid_header(block: &Block, header_dir: &str) -> Result<(), BlockHe
     let block_header_roots: BlockHeaderRoots = block_header.clone().try_into()?; // TODO: Errors
 
     if header_roots != block_header_roots {
-        return Err(BlockHeaderError::MismatchedRoots(
+        return Err(BlockHeaderError::MismatchedRoots(Box::new((
             header_roots,
             block_header_roots,
-        ));
+        ))));
     }
 
     Ok(())