diff --git a/src/index.ts b/src/index.ts
index 5e14ad44..20c0e981 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -304,7 +304,7 @@ const typescript: PluginImpl<RPT2Options> = (options) =>
 			parsedConfig.fileNames.forEach((name) =>
 			{
 				const key = normalize(name);
-				if (key in declarations)
+				if (key in declarations || !filter(key))
 					return;
 
 				context.debug(() => `generating missed declarations for '${key}'`);