diff --git a/arch/sh/defs.h b/arch/sh/defs.h
index 0367560..2090e87 100644
--- a/arch/sh/defs.h
+++ b/arch/sh/defs.h
@@ -4,6 +4,7 @@
 #define REG_SZ			(4)
 #define MCONTEXT_GREGS		(24)
 
+#define REG_SP			(15)
 #define REG_PC			(16)
 #define REG_PR			(17)
 #define REG_SR			(18)
diff --git a/arch/sh/makecontext.c b/arch/sh/makecontext.c
index dafc1f9..76a0dfd 100644
--- a/arch/sh/makecontext.c
+++ b/arch/sh/makecontext.c
@@ -34,7 +34,7 @@ libucontext_makecontext(libucontext_ucontext_t *ucp, void (*func)(void), int arg
 	sp -= argc > 4 ? argc - 4 : 0;
 
 	/* set up the context */
-	ucp->uc_mcontext.sr = (libucontext_greg_t) sp;
+	ucp->uc_mcontext.gregs[REG_SP] = (libucontext_greg_t) sp;
 	ucp->uc_mcontext.pr = (libucontext_greg_t) libucontext_trampoline;
 	ucp->uc_mcontext.pc = (libucontext_greg_t) func;
 	ucp->uc_mcontext.gregs[8] = (libucontext_greg_t) ucp->uc_link;