diff --git a/src/lib/libpthread.js b/src/lib/libpthread.js
index 6b07f590eefda..64f49ea429292 100644
--- a/src/lib/libpthread.js
+++ b/src/lib/libpthread.js
@@ -22,6 +22,9 @@
 #if EVAL_CTORS
 #error "EVAL_CTORS is not compatible with pthreads yet (passive segments)"
 #endif
+#if EXPORT_ES6 && (MIN_FIREFOX_VERSION < 114 || MIN_CHROME_VERSION < 80 || MIN_SAFARI_VERSION < 150000)
+#error "internal error, feature_matrix should not allow this"
+#endif
 
 {{{
 #if MEMORY64
@@ -42,15 +45,6 @@ const pthreadWorkerScript = TARGET_JS_NAME;
 // See https://github.com/emscripten-core/emscripten/issues/22394
 const pthreadWorkerOptions = `{
 #if EXPORT_ES6
-#if MIN_FIREFOX_VERSION < 114
-#error new Worker() supports ECMAScript module only starting from Firefox 114. Pass -sMIN_FIREFOX_VERSION=114 to target -sEXPORT_ES6 with -pthread. See https://caniuse.com/mdn-api_worker_worker_ecmascript_modules
-#endif
-#if MIN_CHROME_VERSION < 80
-#error new Worker() supports ECMAScript module only starting from Chrome 80. Pass -sMIN_CHROME_VERSION=80 to target -sEXPORT_ES6 with -pthread. See https://caniuse.com/mdn-api_worker_worker_ecmascript_modules
-#endif
-#if MIN_SAFARI_VERSION < 150000
-#error new Worker() supports ECMAScript module only starting from Safari 15. Pass -sMIN_SAFARI_VERSION=150000 to target -sEXPORT_ES6 with -pthread. See https://caniuse.com/mdn-api_worker_worker_ecmascript_modules
-#endif
         'type': 'module',
 #endif
 #if ENVIRONMENT_MAY_BE_NODE
diff --git a/src/lib/libwasm_worker.js b/src/lib/libwasm_worker.js
index 7a3e0dfeeb66c..385002ea3b162 100644
--- a/src/lib/libwasm_worker.js
+++ b/src/lib/libwasm_worker.js
@@ -24,6 +24,9 @@
 #if WASM2JS && MODULARIZE
 #error "-sWASM=0 + -sMODULARIZE + -sWASM_WORKERS is not supported"
 #endif
+#if EXPORT_ES6 && (MIN_FIREFOX_VERSION < 114 || MIN_CHROME_VERSION < 80 || MIN_SAFARI_VERSION < 150000)
+#error "internal error, feature_matrix should not allow this"
+#endif
 
 {{{
   const workerSupportsFutexWait = () => AUDIO_WORKLET ? "!ENVIRONMENT_IS_AUDIO_WORKLET" : '1';
@@ -40,15 +43,6 @@
 `;
   const wasmWorkerOptions = `{
 #if EXPORT_ES6
-#if MIN_FIREFOX_VERSION < 114
-#error new Worker() supports ECMAScript module only starting from Firefox 114. Pass -sMIN_FIREFOX_VERSION=114 to target -sEXPORT_ES6 with -sWASM_WORKERS. See https://caniuse.com/mdn-api_worker_worker_ecmascript_modules
-#endif
-#if MIN_CHROME_VERSION < 80
-#error new Worker() supports ECMAScript module only starting from Chrome 80. Pass -sMIN_CHROME_VERSION=80 to target -sEXPORT_ES6 with -sWASM_WORKERS. See https://caniuse.com/mdn-api_worker_worker_ecmascript_modules
-#endif
-#if MIN_SAFARI_VERSION < 150000
-#error new Worker() supports ECMAScript module only starting from Safari 15. Pass -sMIN_SAFARI_VERSION=150000 to target -sEXPORT_ES6 with -sWASM_WORKERS. See https://caniuse.com/mdn-api_worker_worker_ecmascript_modules
-#endif
   'type': 'module',
 #endif
 #if ENVIRONMENT_MAY_BE_NODE