diff --git a/mingw-w64-headers/crt/stdlib.h b/mingw-w64-headers/crt/stdlib.h
index 4829713..2a43593 100644
--- a/mingw-w64-headers/crt/stdlib.h
+++ b/mingw-w64-headers/crt/stdlib.h
@@ -192,7 +192,7 @@
 #endif
 
 #ifndef _POSIX_
-#if (defined(_ARM_) || defined(__arm__) || defined(_ARM64_) || defined(__aarch64__)) && !defined(_UCRT)
+#if (defined(_ARM_) || defined(__arm__) || defined(_ARM64_) || defined(__aarch64__) || defined(_ARM64EC_) || defined(__arm64ec__)) && !defined(_UCRT)
   /* The plain msvcrt.dll for arm/aarch64 lacks
    * _environ/_wenviron, but has these functions instead. */
   _CRTIMP void __cdecl _get_environ(char ***);