diff --git a/arch/sandbox/cpu/state.c b/arch/sandbox/cpu/state.c
index dee5fde..cd46e00 100644
--- a/arch/sandbox/cpu/state.c
+++ b/arch/sandbox/cpu/state.c
@@ -356,6 +356,7 @@
 	/* No reset yet, so mark it as such. Always allow power reset */
 	state->last_sysreset = SYSRESET_COUNT;
 	state->sysreset_allowed[SYSRESET_POWER_OFF] = true;
+	state->allow_memio = false;
 
 	memset(&state->wdt, '\0', sizeof(state->wdt));
 	memset(state->spi, '\0', sizeof(state->spi));