diff --git a/raspi-config b/raspi-config
index bfb4e9f..c9eff05 100755
--- a/raspi-config
+++ b/raspi-config
@@ -492,7 +492,7 @@ do_change_locale() {
     dpkg-reconfigure locales
   else
     local LOCALE="$1"
-    if ! LOCALE_LINE="$(grep "^$LOCALE " /usr/share/i18n/SUPPORTED)"; then
+    if ! LOCALE_LINE="$(grep -E "^$LOCALE( |$)" /usr/share/i18n/SUPPORTED)"; then
       return 1
     fi
     local ENCODING="$(echo $LOCALE_LINE | cut -f2 -d " ")"