diff --git a/compiler/packages/react-compiler-healthcheck/src/checks/reactCompiler.ts b/compiler/packages/react-compiler-healthcheck/src/checks/reactCompiler.ts
index 1dc210bef8..b122a89a19 100644
--- a/compiler/packages/react-compiler-healthcheck/src/checks/reactCompiler.ts
+++ b/compiler/packages/react-compiler-healthcheck/src/checks/reactCompiler.ts
@@ -102,7 +102,7 @@ function compile(sourceCode: string, filename: string) {
   } catch {}
 }
 
-const JsFileExtensionRE = /(js|ts|jsx|tsx|mjs)$/;
+const JsFileExtensionRE = /(js|ts|jsx|tsx)$/;
 
 export default {
   run(source: string, path: string): void {
diff --git a/compiler/packages/react-compiler-healthcheck/src/checks/strictMode.ts b/compiler/packages/react-compiler-healthcheck/src/checks/strictMode.ts
index 8992eab5f6..49df1dd5e9 100644
--- a/compiler/packages/react-compiler-healthcheck/src/checks/strictMode.ts
+++ b/compiler/packages/react-compiler-healthcheck/src/checks/strictMode.ts
@@ -7,7 +7,7 @@
 
 import chalk from "chalk";
 
-const JsFileExtensionRE = /(js|ts|jsx|tsx|mjs)$/;
+const JsFileExtensionRE = /(js|ts|jsx|tsx)$/;
 const StrictModeRE = /\<StrictMode\>/;
 let StrictModeUsage = false;