diff --git a/vendor/README.craft-reader.md b/vendor/README.craft-reader.md
index 6967ee6f..081229c2 100644
--- a/vendor/README.craft-reader.md
+++ b/vendor/README.craft-reader.md
@@ -321,6 +321,9 @@ products match its vertices (moving the points alone skewed barycentric coordina
 `restore_state` doesn't when the saved-state bound skipped the save; and a resolved JP2
 palette decodes to 8 bits whatever `/BitsPerComponent` the dictionary gives.
 
+`hayro-syntax` compiles `filter::ccitt_max_rows` and its unit tests only with the
+`images` feature, matching `filter::ccitt`.
+
 This remains the patched 0.7 backend. It retains the existing Bradford Lab conversion,
 floating component precision and codec versions, rather than claiming full 0.8
 equivalence. The independent color oracles, backend tests and facade contracts cover
diff --git a/vendor/hayro-syntax/SOURCE.json b/vendor/hayro-syntax/SOURCE.json
index f2577bd3..820ae09c 100644
--- a/vendor/hayro-syntax/SOURCE.json
+++ b/vendor/hayro-syntax/SOURCE.json
@@ -176,7 +176,7 @@
       "path": "src/filter/mod.rs",
       "source_sha256": "0af7145ab16b15b7a60c4b57efecb9bd5fd0cfdc9bb5f9388abb695386e63e49",
       "source_git_blob": "06bda29487d62c25dc39c1ee109091cb17e3867f",
-      "sha256": "727fd21fe968d0ce9de54ea0c50658af43658289f9b38b27fbc74596e48d0d4b"
+      "sha256": "a3bf1dbe731aca35808ec7f22f1d58bb5f0f4e3ce9087260d1e38800baf33bd8"
     },
     {
       "path": "src/filter/run_length.rs",
diff --git a/vendor/hayro-syntax/src/filter/mod.rs b/vendor/hayro-syntax/src/filter/mod.rs
index 9da38e20..30b3fae6 100644
--- a/vendor/hayro-syntax/src/filter/mod.rs
+++ b/vendor/hayro-syntax/src/filter/mod.rs
@@ -176,13 +176,14 @@ const MAX_CCITT_PIXELS: u64 = 1 << 28;
 
 /// PdfCraft patch: the most rows of `columns` pixels, `row_bytes` bytes each once decoded, that fit
 /// both `limit` bytes and the pixel cap; at least one when one row fits.
+#[cfg(feature = "images")]
 pub(crate) fn ccitt_max_rows(columns: u32, row_bytes: u32, limit: usize) -> u32 {
     let by_pixels = MAX_CCITT_PIXELS / u64::from(columns.max(1));
     let by_bytes = u64::try_from(limit).unwrap_or(u64::MAX) / u64::from(row_bytes.max(1));
     u32::try_from(by_pixels.min(by_bytes)).unwrap_or(u32::MAX)
 }
 
-#[cfg(test)]
+#[cfg(all(test, feature = "images"))]
 mod ccitt_tests {
     use super::ccitt_max_rows;