diff --git a/test/integration/good/comments.stan b/test/integration/good/comments.stan
index ce3947a9d..945c74cc4 100644
--- a/test/integration/good/comments.stan
+++ b/test/integration/good/comments.stan
@@ -23,3 +23,11 @@ transformed data {
       array[N/*test1*/ , //test1.5
     N/*test2*/] real arr;
 }
+
+model {
+  // unicode in comments
+  // Љ😃
+  /*
+  λ β ζ π
+  //*/
+}
diff --git a/test/integration/good/pretty.expected b/test/integration/good/pretty.expected
index b46b537b4..56116088b 100644
--- a/test/integration/good/pretty.expected
+++ b/test/integration/good/pretty.expected
@@ -1359,6 +1359,13 @@ transformed data {
   
   /* ^^^:test2*/
 }
+model {
+  // unicode in comments
+  // Љ😃
+  /*
+  λ β ζ π
+  //*/
+}
 
   $ ../../../../install/default/bin/stanc --auto-format conditional_condition_good.stan
 parameters {