diff --git a/src/test/ui/consts/const-float-bits-conv.rs b/src/test/ui/consts/const-float-bits-conv.rs
index ca5df9b0e97b..2dfc6de85978 100644
--- a/src/test/ui/consts/const-float-bits-conv.rs
+++ b/src/test/ui/consts/const-float-bits-conv.rs
@@ -1,4 +1,4 @@
-// -Zmir-opt-level=0
+// compile-flags: -Zmir-opt-level=0
 // run-pass
 
 #![feature(const_panic)]
diff --git a/src/test/ui/consts/const-float-classify.rs b/src/test/ui/consts/const-float-classify.rs
index 539595db1137..36fec9976be3 100644
--- a/src/test/ui/consts/const-float-classify.rs
+++ b/src/test/ui/consts/const-float-classify.rs
@@ -1,4 +1,4 @@
-// -Zmir-opt-level=0
+// compile-flags: -Zmir-opt-level=0
 // run-pass
 
 #![feature(const_panic)]