diff --git a/zebra-chain/src/work/difficulty.rs b/zebra-chain/src/work/difficulty.rs
index 6443e2b27e7..846583eb89c 100644
--- a/zebra-chain/src/work/difficulty.rs
+++ b/zebra-chain/src/work/difficulty.rs
@@ -98,7 +98,7 @@ impl fmt::Debug for ExpandedDifficulty {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         let mut buf = [0; 32];
         // Use the same byte order as block::Hash
-        self.0.to_little_endian(&mut buf);
+        self.0.to_big_endian(&mut buf);
         f.debug_tuple("ExpandedDifficulty")
             .field(&hex::encode(&buf))
             .finish()
diff --git a/zebra-chain/src/work/difficulty/tests/vectors.rs b/zebra-chain/src/work/difficulty/tests/vectors.rs
index a906b8e33ea..9379c88a9a7 100644
--- a/zebra-chain/src/work/difficulty/tests/vectors.rs
+++ b/zebra-chain/src/work/difficulty/tests/vectors.rs
@@ -36,7 +36,7 @@ fn debug_format() {
     );
     assert_eq!(
         format!("{:?}", ExpandedDifficulty(U256::one())),
-        "ExpandedDifficulty(\"0100000000000000000000000000000000000000000000000000000000000000\")"
+        "ExpandedDifficulty(\"0000000000000000000000000000000000000000000000000000000000000001\")"
     );
     assert_eq!(
         format!("{:?}", ExpandedDifficulty(U256::MAX)),
@@ -44,6 +44,7 @@ fn debug_format() {
     );
 
     assert_eq!(format!("{:?}", Work(0)), "Work(0x0, 0, -inf)");
+    assert_eq!(format!("{:?}", Work(1)), "Work(0x1, 1, 0.00000)");
     assert_eq!(
         format!("{:?}", Work(u8::MAX as u128)),
         "Work(0xff, 255, 7.99435)"