diff --git a/highlighters/main/test-data/command-substitution-unclosed.zsh b/highlighters/main/test-data/command-substitution-unclosed.zsh
index 6a2b73d..198e710 100644
--- a/highlighters/main/test-data/command-substitution-unclosed.zsh
+++ b/highlighters/main/test-data/command-substitution-unclosed.zsh
@@ -37,3 +37,7 @@ expected_region_highlight=(
   '8 11 builtin' # echo
   '13 15 default' # bar
 )
+
+if [[ ${(z):-'$('} == '$( ' ]]; then # ignore zsh 5.0.8 bug
+  expected_region_highlight[2]='3 16 default' # foo$(echo bar
+fi
diff --git a/highlighters/main/test-data/process-substitution2.zsh b/highlighters/main/test-data/process-substitution2.zsh
index da3f41f..dff3108 100644
--- a/highlighters/main/test-data/process-substitution2.zsh
+++ b/highlighters/main/test-data/process-substitution2.zsh
@@ -41,3 +41,7 @@ expected_region_highlight=(
   '19 22 builtin' # echo
   '24 26 default' # foo
 )
+
+if [[ ${(z):-'$('} == '$( ' ]]; then # ignore zsh 5.0.8 bug
+  expected_region_highlight[6]='17 27 default' # =(echo foo
+fi