diff --git a/block/src/error.rs b/block/src/error.rs
index b235b17e4..645057005 100644
--- a/block/src/error.rs
+++ b/block/src/error.rs
@@ -242,56 +242,4 @@ impl From<io::Error> for BlockError {
     }
 }
 
-/// Temporary scaffolding: classify a `qcow::Error` into the appropriate
-/// `BlockErrorKind`.
-///
-/// This impl exists only to allow an incremental migration of the qcow
-/// parse/construct chain from `qcow::Result` to `BlockResult`. Each
-/// subsequent commit replaces bare `?` sites with explicit
-/// `BlockError::new(kind, e)` calls. Once every site is migrated this
-/// impl will be removed.
-impl From<crate::qcow::Error> for BlockError {
-    fn from(e: crate::qcow::Error) -> Self {
-        use crate::qcow::Error as E;
-        let kind = match &e {
-            // Structural / format violations
-            E::InvalidMagic
-            | E::BackingFileTooLong(_)
-            | E::InvalidBackingFileName(_)
-            | E::InvalidClusterSize
-            | E::InvalidL1TableSize(_)
-            | E::InvalidL1TableOffset
-            | E::InvalidOffset(_)
-            | E::InvalidRefcountTableOffset
-            | E::InvalidRefcountTableSize(_)
-            | E::FileTooBig(_)
-            | E::NoRefcountClusters
-            | E::RefcountTableOffEnd
-            | E::RefcountTableTooLarge
-            | E::TooManyL1Entries(_)
-            | E::TooManyRefcounts(_)
-            | E::SizeTooSmallForNumberOfClusters => BlockErrorKind::InvalidFormat,
-
-            // Unsupported features / versions
-            E::UnsupportedVersion(_)
-            | E::UnsupportedFeature(_)
-            | E::UnsupportedCompressionType
-            | E::UnsupportedBackingFileFormat(_)
-            | E::UnsupportedRefcountOrder
-            | E::BackingFilesDisabled
-            | E::ShrinkNotSupported => BlockErrorKind::UnsupportedFeature,
-
-            // Corrupt image
-            E::CorruptImage => BlockErrorKind::CorruptImage,
-
-            // Nesting depth overflow
-            E::MaxNestingDepthExceeded => BlockErrorKind::Overflow,
-
-            // Everything else is I/O
-            _ => BlockErrorKind::Io,
-        };
-        Self::new(kind, e)
-    }
-}
-
 pub type BlockResult<T> = Result<T, BlockError>;