diff --git a/src/openvpn/error.h b/src/openvpn/error.h
index 44572b4..1198994 100644
--- a/src/openvpn/error.h
+++ b/src/openvpn/error.h
@@ -245,14 +245,6 @@
 #endif
     ;
 
-/* Poor-man's static_assert() for when not supplied by assert.h, taken from
- * Linux's sys/cdefs.h under GPLv2 */
-#ifndef static_assert
-#define static_assert(expr, diagnostic)            \
-    extern int (*__OpenVPN_static_assert_function( \
-        void))[!!sizeof(struct { int __error_if_negative : (expr) ? 2 : -1; })]
-#endif
-
 /* Inline functions */
 
 static inline bool