diff --git a/libcxx/include/random b/libcxx/include/random
--- a/libcxx/include/random
+++ b/libcxx/include/random
@@ -4035,12 +4035,12 @@
         {return !(__x == __y);}
 };
 
-#ifndef _LIBCPP_MSVCRT
+#ifndef _LIBCPP_MSVCRT_LIKE
 extern "C" double lgamma_r(double, int *);
 #endif
 
 inline _LIBCPP_INLINE_VISIBILITY double __libcpp_lgamma(double __d) {
-#if defined(_LIBCPP_MSVCRT)
+#if defined(_LIBCPP_MSVCRT_LIKE)
   return lgamma(__d);
 #else
   int __sign;