diff --git a/hw/intc/armv7m_nvic.c b/hw/intc/armv7m_nvic.c
index 9336bca142..456480a3f2 100644
--- a/hw/intc/armv7m_nvic.c
+++ b/hw/intc/armv7m_nvic.c
@@ -716,10 +716,14 @@ static void nvic_writel(NVICState *s, uint32_t offset, uint32_t value)
                 qemu_irq_pulse(s->sysresetreq);
             }
             if (value & 2) {
-                qemu_log_mask(LOG_UNIMP, "VECTCLRACTIVE unimplemented\n");
+                qemu_log_mask(LOG_GUEST_ERROR,
+                              "Setting VECTCLRACTIVE when not in DEBUG mode "
+                              "is UNPREDICTABLE\n");
             }
             if (value & 1) {
-                qemu_log_mask(LOG_UNIMP, "AIRCR system reset unimplemented\n");
+                qemu_log_mask(LOG_GUEST_ERROR,
+                              "Setting VECTRESET when not in DEBUG mode "
+                              "is UNPREDICTABLE\n");
             }
             s->prigroup = extract32(value, 8, 3);
             nvic_irq_update(s);