diff --git a/stdlib/public/stubs/Random.cpp b/stdlib/public/stubs/Random.cpp
index 4a44682761656..5c4981e613119 100644
--- a/stdlib/public/stubs/Random.cpp
+++ b/stdlib/public/stubs/Random.cpp
@@ -39,6 +39,10 @@
 
 #endif
 
+#if __has_include(<unistd.h>)
+#include <unistd.h>
+#endif
+
 #include <stdlib.h>
 
 #include "SwiftShims/Random.h"