diff --git a/arch/common/bits.h b/arch/common/bits.h
index d1296d3..65a039f 100644
--- a/arch/common/bits.h
+++ b/arch/common/bits.h
@@ -5,6 +5,7 @@
 
 #include <ucontext.h>
 
+typedef greg_t libucontext_greg_t;
 typedef ucontext_t libucontext_ucontext_t;
 
 #endif