diff --git a/packages/react-native/scripts/codegen/generate-artifacts-executor/generateRCTThirdPartyComponents.js b/packages/react-native/scripts/codegen/generate-artifacts-executor/generateRCTThirdPartyComponents.js
index 53669facbd7..baadd3eddc9 100644
--- a/packages/react-native/scripts/codegen/generate-artifacts-executor/generateRCTThirdPartyComponents.js
+++ b/packages/react-native/scripts/codegen/generate-artifacts-executor/generateRCTThirdPartyComponents.js
@@ -186,7 +186,7 @@ function findRCTComponentViewProtocolClass(filepath) {
     const lines = fileContent.split('\n');
     const signatureIndex = lines.findIndex(line => regex.test(line));
     const returnRegex = /return (.*)\.class/;
-    const classNameMatch = String(lines.slice(signatureIndex)).match(
+    const classNameMatch = String(lines.slice(signatureIndex).join('\n')).match(
       returnRegex,
     );
     if (classNameMatch) {