diff --git a/src/table_collection.rs b/src/table_collection.rs
index f4bab553..bc0f1872 100644
--- a/src/table_collection.rs
+++ b/src/table_collection.rs
@@ -83,7 +83,7 @@ impl TableCollection {
     ///
     /// Negative sequence lengths are errors:
     ///
-    /// ```{should_panic}
+    /// ```should_panic
     /// let tables = tskit::TableCollection::new(-55.0).unwrap();
     /// ```
     pub fn new<P: Into<Position>>(sequence_length: P) -> Result<Self, TskitError> {
diff --git a/src/trees/treeseq.rs b/src/trees/treeseq.rs
index 4da18ec1..9c761655 100644
--- a/src/trees/treeseq.rs
+++ b/src/trees/treeseq.rs
@@ -220,7 +220,7 @@ impl TreeSequence {
     ///
     /// A `Tree`'s lifetime is tied to that of its tree sequence:
     ///
-    /// ```{compile_fail}
+    /// ```compile_fail
     /// # use streaming_iterator::StreamingIterator;
     /// # use streaming_iterator::DoubleEndedStreamingIterator;
     /// # let mut tables = tskit::TableCollection::new(1000.).unwrap();