diff --git a/highlighters/main/test-data/alias.zsh b/highlighters/main/test-data/alias.zsh
index 5129614..2977343 100644
--- a/highlighters/main/test-data/alias.zsh
+++ b/highlighters/main/test-data/alias.zsh
@@ -29,6 +29,9 @@
 
 alias alias1="unused expansion"
 alias -s alias2="echo"
+if set -o | grep -q aliasfuncdef; then
+  setopt alias_func_def # 5.4+
+fi
 alias1() {} # to check that it's highlighted as an alias, not as a function
 
 BUFFER='x.alias2; alias1'