diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6a87f499..0f6e8e1a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+### Fixed
+  - [589](https://github.com/thoth-pub/thoth/issues/589) - Truncation of `short_abstract` in Thoth ONIX results in Invalid UTF-8 sequences
 
 ## [[0.12.0]](https://github.com/thoth-pub/thoth/releases/tag/v0.12.0) - 2024-03-14
 ### Removed
diff --git a/thoth-export-server/src/xml/onix3_thoth.rs b/thoth-export-server/src/xml/onix3_thoth.rs
index aa68f0b2..0f718536 100644
--- a/thoth-export-server/src/xml/onix3_thoth.rs
+++ b/thoth-export-server/src/xml/onix3_thoth.rs
@@ -422,8 +422,13 @@ impl XmlElementBlock<Onix3Thoth> for Work {
                 })?;
                 write_element_block("CollateralDetail", w, |w| {
                     if let Some(mut short_abstract) = self.short_abstract.clone() {
-                        // Short description field may not exceed 350 characters
-                        short_abstract.truncate(350);
+                        // Short description field may not exceed 350 characters.
+                        // Ensure that the string is truncated at a valid UTF-8 boundary
+                        // by finding the byte index of the 350th character and then truncating
+                        // the string at that index, to avoid creating invalid UTF-8 sequences.
+                        if let Some((byte_index, _)) = short_abstract.char_indices().nth(350) {
+                            short_abstract.truncate(byte_index);
+                        }
                         write_element_block("TextContent", w, |w| {
                             // 02 Short description
                             write_element_block("TextType", w, |w| {