diff --git a/test/compose/unicode/enabled b/test/compose/unicode/enabled
index 8affb9f6..edc44250 100755
--- a/test/compose/unicode/enabled
+++ b/test/compose/unicode/enabled
@@ -1,2 +1,2 @@
 #!/bin/sh
-locale | grep LC_CTYPE | grep 'utf8\|UTF-8' > /dev/null
+locale | grep LC_CTYPE | grep -qi 'utf-*8'
diff --git a/test/regression/811-double-width-codepoints/enabled b/test/regression/811-double-width-codepoints/enabled
new file mode 100755
index 00000000..edc44250
--- /dev/null
+++ b/test/regression/811-double-width-codepoints/enabled
@@ -0,0 +1,2 @@
+#!/bin/sh
+locale | grep LC_CTYPE | grep -qi 'utf-*8'
diff --git a/test/unit/codepoint-width/tab-width/enabled b/test/unit/codepoint-width/tab-width/enabled
new file mode 100755
index 00000000..edc44250
--- /dev/null
+++ b/test/unit/codepoint-width/tab-width/enabled
@@ -0,0 +1,2 @@
+#!/bin/sh
+locale | grep LC_CTYPE | grep -qi 'utf-*8'
diff --git a/test/unit/codepoint-width/vertical-movement/enabled b/test/unit/codepoint-width/vertical-movement/enabled
new file mode 100755
index 00000000..edc44250
--- /dev/null
+++ b/test/unit/codepoint-width/vertical-movement/enabled
@@ -0,0 +1,2 @@
+#!/bin/sh
+locale | grep LC_CTYPE | grep -qi 'utf-*8'