diff --git a/root/plymouth-set-default-theme b/usr/sbin/plymouth-set-default-theme
index 910e8a4..f812d18 100755
--- a/usr/sbin/plymouth-set-default-theme
+++ b/usr/sbin/plymouth-set-default-theme
@@ -138,9 +138,8 @@ function read_or_set_file_ini_value ()

                 if [[ $CONFIG_VALUE_LINE_NUMBER == 0 ]]; then
-                        CONFIG_FILE_LINE_COUNT=$(( $INI_SEGMENT_LINE_NUMBER + 1 ))
-                        sed -i "$CONFIG_FILE_LINE_COUNT i $CONFIG_FILE_VALUE_NAME=$CONFIG_FILE_VALUE_NEW_VALUE" "$CONFIG_FILE_PATH"
+                        sed -i "${INI_SEGMENT_LINE_NUMBER}a\\${CONFIG_FILE_VALUE_NAME}=${CONFIG_FILE_VALUE_NEW_VALUE}" "$CONFIG_FILE_PATH"
                 else
-                        sed -ie "${CONFIG_VALUE_LINE_NUMBER}s/.*/$CONFIG_FILE_VALUE_NAME=$CONFIG_FILE_VALUE_NEW_VALUE/" "$CONFIG_FILE_PATH"
+                        sed -i "${CONFIG_VALUE_LINE_NUMBER}s|.*|${CONFIG_FILE_VALUE_NAME}=${CONFIG_FILE_VALUE_NEW_VALUE}|" "$CONFIG_FILE_PATH"
                 fi
         fi