diff --git a/xso/ChangeLog b/xso/ChangeLog
index 3ca914a1..de26a71c 100644
--- a/xso/ChangeLog
+++ b/xso/ChangeLog
@@ -6,6 +6,7 @@ Version NEXT:
     * Changes
       - Fix some Clippy warnings
       - Fix build with minidom and without std (!661)
+      - Fix no_std build
     * Added
       - xso::from_bytes_with_options and xso::from_reader_with_options to allow
         passing custom parser configuration.
diff --git a/xso/src/lib.rs b/xso/src/lib.rs
index a2eb3fdd..299c5873 100644
--- a/xso/src/lib.rs
+++ b/xso/src/lib.rs
@@ -702,6 +702,7 @@ fn read_start_event_io(
     ))
 }
 
+#[cfg(feature = "std")]
 fn from_reader_inner<T: FromXml, R: io::BufRead>(
     mut reader: rxml::XmlLangTracker<rxml::Reader<R>>,
 ) -> io::Result<T> {