diff --git a/src/tools/run-make-support/src/rustc.rs b/src/tools/run-make-support/src/rustc.rs
index d034826a830b4..f581204d5f1cb 100644
--- a/src/tools/run-make-support/src/rustc.rs
+++ b/src/tools/run-make-support/src/rustc.rs
@@ -64,6 +64,12 @@ impl Rustc {
         self
     }
 
+    /// Specify a specific optimization level.
+    pub fn opt_level(&mut self, option: &str) -> &mut Self {
+        self.cmd.arg(format!("-Copt-level={option}"));
+        self
+    }
+
     /// Specify type(s) of output files to generate.
     pub fn emit(&mut self, kinds: &str) -> &mut Self {
         self.cmd.arg(format!("--emit={kinds}"));
diff --git a/tests/run-make/no-mark-noalias/rmake.rs b/tests/run-make/no-mark-noalias/rmake.rs
index 5e5868248ce6c..d47cc998961b6 100644
--- a/tests/run-make/no-mark-noalias/rmake.rs
+++ b/tests/run-make/no-mark-noalias/rmake.rs
@@ -9,6 +9,6 @@
 use run_make_support::{run, rustc};
 
 fn main() {
-    rustc().input("main.rs").opt-level("1").run();
+    rustc().input("main.rs").opt_level("1").run();
     run("main");
 }