$slotDiffRenderer->setLanguage( $contentLanguage );
$engine = DifferenceEngine::getEngine();
- if ( $engine === false ) {
+ if ( $engine === 'php' ) {
$slotDiffRenderer->setEngine( TextSlotDiffRenderer::ENGINE_PHP );
} elseif ( $engine === 'wikidiff2' ) {
$slotDiffRenderer->setEngine( TextSlotDiffRenderer::ENGINE_WIKIDIFF2 );