diff --git a/Containers/mastercontainer/start.sh b/Containers/mastercontainer/start.sh
index c41fd995..7c0276de 100644
--- a/Containers/mastercontainer/start.sh
+++ b/Containers/mastercontainer/start.sh
@@ -186,7 +186,7 @@ It is set to '$NEXTCLOUD_STARTUP_APPS'."
     fi
 fi
 if [ -n "$NEXTCLOUD_ADDITIONAL_APKS" ]; then
-    if ! echo "$NEXTCLOUD_ADDITIONAL_APKS" | grep -q "^[a-z0-9 _-.]\+$"; then
+    if ! echo "$NEXTCLOUD_ADDITIONAL_APKS" | grep -q "^[a-z0-9 ._-]\+$"; then
         echo "You've set NEXTCLOUD_ADDITIONAL_APKS but not to an allowed value.
 It needs to be a string. Allowed are small letters a-z, digits 0-9, spaces, hyphens, dots and '_'.
 It is set to '$NEXTCLOUD_ADDITIONAL_APKS'."
@@ -194,7 +194,7 @@ It is set to '$NEXTCLOUD_ADDITIONAL_APKS'."
     fi
 fi
 if [ -n "$NEXTCLOUD_ADDITIONAL_PHP_EXTENSIONS" ]; then
-    if ! echo "$NEXTCLOUD_ADDITIONAL_PHP_EXTENSIONS" | grep -q "^[a-z0-9 _-.]\+$"; then
+    if ! echo "$NEXTCLOUD_ADDITIONAL_PHP_EXTENSIONS" | grep -q "^[a-z0-9 ._-]\+$"; then
         echo "You've set NEXTCLOUD_ADDITIONAL_PHP_EXTENSIONS but not to an allowed value.
 It needs to be a string. Allowed are small letters a-z, digits 0-9, spaces, hyphens, dots and '_'.
 It is set to '$NEXTCLOUD_ADDITIONAL_PHP_EXTENSIONS'."