diff --git a/vendor/README.craft-reader.md b/vendor/README.craft-reader.md
index 268d193a0..a3d174e67 100644
--- a/vendor/README.craft-reader.md
+++ b/vendor/README.craft-reader.md
@@ -324,6 +324,9 @@ 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 195c09b79..75f35b6d4 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": "3719baece25774c09263307b823ef36e834ea095e0d1728cfc664a64123fc340"
+      "sha256": "74127a32b9ac86e33f41ac10f9a51a95849caca9211b0f7ee7eb535f5a59d063"
     },
     {
       "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 271322afd..f25e7b101 100644
--- a/vendor/hayro-syntax/src/filter/mod.rs
+++ b/vendor/hayro-syntax/src/filter/mod.rs
@@ -182,13 +182,14 @@ 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;