diff --git a/sys/compat/linux/linux_signal.c b/sys/compat/linux/linux_signal.c
index d47dd4fc09cd..ba4c481e32e9 100644
--- a/sys/compat/linux/linux_signal.c
+++ b/sys/compat/linux/linux_signal.c
@@ -524,7 +524,7 @@ linux_sigaltstack(p, uap)
 
 #ifdef DEBUG
 	printf("Linux-emul(%ld): sigaltstack(%p, %p)\n",
-	    (long)p->p_pid, args->uss, args->uoss);
+	    (long)p->p_pid, uap->uss, uap->uoss);
 #endif
 
 	error = copyin(uap->uss, &lss, sizeof(linux_stack_t));
diff --git a/sys/i386/linux/linux_signal.c b/sys/i386/linux/linux_signal.c
index d47dd4fc09cd..ba4c481e32e9 100644
--- a/sys/i386/linux/linux_signal.c
+++ b/sys/i386/linux/linux_signal.c
@@ -524,7 +524,7 @@ linux_sigaltstack(p, uap)
 
 #ifdef DEBUG
 	printf("Linux-emul(%ld): sigaltstack(%p, %p)\n",
-	    (long)p->p_pid, args->uss, args->uoss);
+	    (long)p->p_pid, uap->uss, uap->uoss);
 #endif
 
 	error = copyin(uap->uss, &lss, sizeof(linux_stack_t));