diff --git a/tests/data/test1034 b/tests/data/test1034
index 2dab1ab441..b99368fb9f 100644
--- a/tests/data/test1034
+++ b/tests/data/test1034
@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="ISO-8859-1"?>
+<?xml version="1.0" encoding="US-ASCII"?>
 <testcase>
 <info>
 <keywords>
diff --git a/tests/data/test1160 b/tests/data/test1160
index b5b55a4d29..eb0dad216e 100644
--- a/tests/data/test1160
+++ b/tests/data/test1160
@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="ISO-8859-1"?>
+<?xml version="1.0" encoding="US-ASCII"?>
 <testcase>
 <info>
 <keywords>
diff --git a/tests/data/test446 b/tests/data/test446
index 7f98912560..be7bad0e96 100644
--- a/tests/data/test446
+++ b/tests/data/test446
@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="ISO-8859-1"?>
+<?xml version="1.0" encoding="US-ASCII"?>
 <testcase>
 <info>
 <keywords>