foo.diff

diff --git a/devtools/client/debugger/test/mochitest/browser_dbg-expressions.js b/devtools/client/debugger/test/mochitest/browser_dbg-expressions.js
index ff8c2f04b2cb..e795a327223c 100644
--- a/devtools/client/debugger/test/mochitest/browser_dbg-expressions.js
+++ b/devtools/client/debugger/test/mochitest/browser_dbg-expressions.js
@@ -30,17 +30,25 @@ function assertEmptyValue(dbg, index) {
 
 add_task(async function() {
   const dbg = await initDebugger("doc-script-switching.html");
+  const { getExpression } = dbg.selectors;
 
   invokeInTab("firstCall");
   await waitForPaused(dbg);
 
   await addExpression(dbg, "f");
+
   is(getLabel(dbg, 1), "f");
   is(getValue(dbg, 1), "(unavailable)");
 
   await editExpression(dbg, "oo");
+  await waitForState(
+    dbg,
+    () => getExpression("foo").value.result.displayName == "foo"
+  )
+
   is(getLabel(dbg, 1), "foo()");
 
+
   // There is no "value" element for functions.
   assertEmptyValue(dbg, 1);