diff --git a/support/stdio.c b/support/stdio.c
index 78c900e9d9b2..e5b54da47b90 100644
--- a/support/stdio.c
+++ b/support/stdio.c
@@ -26,7 +26,7 @@ Mono_Posix_Syscall_L_ctermid (void)
 gint32
 Mono_Posix_Syscall_L_cuserid (void)
 {
-#ifdef __APPLE__
+#if defined(__APPLE__) || defined (__OpenBSD__)
 	return -1;
 #else
 	return L_cuserid;