diff --git a/packages/rtk-query-codegen-openapi/src/bin/cli.ts b/packages/rtk-query-codegen-openapi/src/bin/cli.ts
index d3650416d..a43bce583 100644
--- a/packages/rtk-query-codegen-openapi/src/bin/cli.ts
+++ b/packages/rtk-query-codegen-openapi/src/bin/cli.ts
@@ -38,7 +38,7 @@ const configFile = program.args[0];
 if (program.args.length === 0 || !/\.(c?(jsx?|tsx?)|jsonc?)?$/.test(configFile)) {
   program.help();
 } else {
-  if (/\.[mc]?tsx?$/.test(configFile) && !ts) {
+  if (/\.c?tsx?$/.test(configFile) && !ts) {
     console.error('Encountered a TypeScript configfile, but neither esbuild-runner nor ts-node are installed.');
     process.exit(1);
   }