1 files changed, 1 insertions, 3 deletions
diff --git a/devtools/client/debugger/test/mochitest/browser_dbg-dom-mutation-breakpoints.js b/devtools/client/debugger/test/mochitest/browser_dbg-dom-mutation-breakpoints.js
index e26ca0493b..de10014069 100644
--- a/devtools/client/debugger/test/mochitest/browser_dbg-dom-mutation-breakpoints.js
+++ b/devtools/client/debugger/test/mochitest/browser_dbg-dom-mutation-breakpoints.js
@@ -146,9 +146,7 @@ add_task(async function () {
   await resume(dbg);
 
   info("Blackboxing the source prevents debugger pause");
-  await waitForSource(dbg, "dom-mutation.original.js");
-
-  const source = findSource(dbg, "dom-mutation.original.js");
+  const source = await waitForSource(dbg, "dom-mutation.original.js");
 
   await selectSource(dbg, source);
   await clickElement(dbg, "blackbox");