--- a/mono/utils/mono-context.h	2019-03-22 04:57:54.560641101 +0000
+++ b/mono/utils/mono-context.h	2019-03-22 04:58:27.765211676 +0000
@@ -865,7 +865,7 @@
 
 #define MONO_ARCH_HAS_MONO_CONTEXT 1
 
-typedef struct ucontext MonoContext;
+typedef ucontext_t MonoContext;
 
 #define MONO_CONTEXT_SET_IP(ctx,ip) 					\
 	do {								\