diff --git a/arch/um/include/os.h b/arch/um/include/os.h
index 583329d0a539a012196b2fe0e72e68926865d127..6f766e1faeccd1bd806ddeb09546002c7e898d31 100644
--- a/arch/um/include/os.h
+++ b/arch/um/include/os.h
@@ -157,6 +157,10 @@ extern int os_lock_file(int fd, int excl);
 extern void os_early_checks(void);
 extern int can_do_skas(void);
 
+/* Make sure they are clear when running in TT mode. Required by
+ * SEGV_MAYBE_FIXABLE */
+#define clear_can_do_skas() do { ptrace_faultinfo = proc_mm = 0; } while (0)
+
 /* mem.c */
 extern int create_mem_file(unsigned long len);
 
diff --git a/arch/um/kernel/um_arch.c b/arch/um/kernel/um_arch.c
index f0a275947d34b18dea67b432c1543c054738d35f..93dc782dc1cc8f5d790b2151694c4caf757238d0 100644
--- a/arch/um/kernel/um_arch.c
+++ b/arch/um/kernel/um_arch.c
@@ -334,6 +334,8 @@ int linux_main(int argc, char **argv)
 		add_arg(DEFAULT_COMMAND_LINE);
 
 	os_early_checks();
+	if (force_tt)
+		clear_can_do_skas();
 	mode_tt = force_tt ? 1 : !can_do_skas();
 #ifndef CONFIG_MODE_TT
 	if (mode_tt) {