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 4aea9f734bf..f7e74b68d2d 100644
--- a/packages/react-native/scripts/codegen/generate-artifacts-executor/generateRCTThirdPartyComponents.js
+++ b/packages/react-native/scripts/codegen/generate-artifacts-executor/generateRCTThirdPartyComponents.js
@@ -193,7 +193,7 @@ function findRCTComponentViewProtocolClass(filepath /*: string */) {
     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) {