diff --git a/tests/test-perfs.zsh b/tests/test-perfs.zsh
index a032978..2b003fc 100755
--- a/tests/test-perfs.zsh
+++ b/tests/test-perfs.zsh
@@ -73,7 +73,7 @@ run_test_internal() {
 
   # Measure the time taken by _zsh_highlight.
   TIMEFMT="%*Es"
-  time (BUFFER="$BUFFER" && _zsh_highlight)
+  { time (BUFFER="$BUFFER" && _zsh_highlight) } 2>&1
 }
 
 run_test() {