diff --git a/test/sequential/test-debugger-sb-before-load.js b/test/sequential/test-debugger-sb-before-load.js
index 3ab84db931834f..e2267156b7420b 100644
--- a/test/sequential/test-debugger-sb-before-load.js
+++ b/test/sequential/test-debugger-sb-before-load.js
@@ -26,7 +26,7 @@ const cli = startCLI([script]);
   assert.match(cli.output, /not loaded yet/,
                'warns that the script was not loaded yet');
   await cli.stepCommand('cont');
-  assert.ok(cli.output.includes, `break in ${otherScript}:2`,
+  assert.ok(cli.output.includes(`break in ${otherScript}:2`),
             'found breakpoint in file that was not loaded yet');
 })()
 .then(common.mustCall())