diff --git a/tests/test-perfs.zsh b/tests/test-perfs.zsh
index a84e147..ff083de 100755
--- a/tests/test-perfs.zsh
+++ b/tests/test-perfs.zsh
@@ -48,6 +48,7 @@
 }
 
 # Load the main script.
+typeset -a region_highlight
 . ${0:h:h}/zsh-syntax-highlighting.zsh
 
 # Activate the highlighter.
diff --git a/tests/test-zprof.zsh b/tests/test-zprof.zsh
index 2538f7d..ada1618 100755
--- a/tests/test-zprof.zsh
+++ b/tests/test-zprof.zsh
@@ -29,6 +29,7 @@
 # -------------------------------------------------------------------------------------------------
 
 # Load the main script.
+typeset -a region_highlight
 . ${0:h:h}/zsh-syntax-highlighting.zsh
 
 # Activate the highlighter.