diff --git a/turtle/src/serializer/_pretty.rs b/turtle/src/serializer/_pretty.rs
index 3c267c4c..d80b5734 100644
--- a/turtle/src/serializer/_pretty.rs
+++ b/turtle/src/serializer/_pretty.rs
@@ -407,6 +407,7 @@ impl<'a, W: Write> Prettifier<'a, W> {
 
     fn find_st_index<T: Term>(&self, term: T) -> Option<usize> {
         find_subject(term, &self.subject_types[self.graph_range.clone()])
+            .map(|i| i + self.graph_range.start)
     }
 }
 
diff --git a/turtle/src/serializer/trig.rs b/turtle/src/serializer/trig.rs
index 2ec8f898..4fda58b5 100644
--- a/turtle/src/serializer/trig.rs
+++ b/turtle/src/serializer/trig.rs
@@ -169,6 +169,11 @@ pub(crate) mod test {
                 _:b rdf:first 43; rdf:rest ().
             }
         "#,
+        r#"# issue 149
+            PREFIX : <https://example.org/>
+            :s :p :o .
+            GRAPH :g { _:b :p2 :o2 }
+        "#,
     ];
 
     #[test]