diff --git a/src/index.ts b/src/index.ts
index 58381c1..40e4080 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -251,8 +251,7 @@ const typescript: PluginImpl<RPT2Options> = (options) =>
 
 			if (result.map)
 			{
-				if (pluginOptions.sourceMapCallback)
-					pluginOptions.sourceMapCallback(id, result.map);
+				pluginOptions.sourceMapCallback?.(id, result.map);
 				transformResult.map = JSON.parse(result.map);
 			}