diff --git a/src/test/pretty/issue-12590-a.rs b/src/test/pretty/issue-12590-a.rs
index 1a9e85c42d8..ca1fef83cff 100644
--- a/src/test/pretty/issue-12590-a.rs
+++ b/src/test/pretty/issue-12590-a.rs
@@ -1,4 +1,5 @@
 // pp-exact
+// pretty-compare-only
 
 // The next line should not be expanded