diff --git a/deps/c-ares_config/ares_build.h b/deps/c-ares_config/ares_build.h
index 24fc1fea..1eddb24b 100644
--- a/deps/c-ares_config/ares_build.h
+++ b/deps/c-ares_config/ares_build.h
@@ -137,7 +137,11 @@
 #define HAVE_IFADDRS_H 1
 #define HAVE_UNISTD_H 1
 #define HAVE_WRITEV 1
+#if defined(__ANDROID__) || defined(__APPLE__) || defined(__OpenBSD__)
 #define HAVE_ARC4RANDOM_BUF 1
+#else
+#undef HAVE_ARC4RANDOM_BUF
+#endif
 #define HAVE_GETIFADDRS 1
 #define HAVE_STAT 1
 #define CARES_RANDOM_FILE "/dev/urandom"