diff --git a/platform/x11/platform_config.h b/platform/x11/platform_config.h
index 21703969cc1..c46ef1cf114 100644
--- a/platform/x11/platform_config.h
+++ b/platform/x11/platform_config.h
@@ -29,7 +29,7 @@
 #ifdef __linux__
 #include <alloca.h>
 #endif
-#ifdef __FreeBSD__
+#if defined(__FreeBSD__) || defined(__OpenBSD__)
 #include <stdlib.h>
 #endif