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	diff --git a/sys/dev/nvme/nvme_ahci.c b/sys/dev/nvme/nvme_ahci.c
	--- a/sys/dev/nvme/nvme_ahci.c
	+++ b/sys/dev/nvme/nvme_ahci.c
	@@ -104,7 +104,14 @@
	}
	ctrlr->tag = (void *)0x1;

	- return nvme_attach(dev);
	+ /*
	+ * We're attached via this funky mechanism. Flag the controller so that
	+ * it avoids things that can't work when we do that, like asking for
	+ * PCI config space entries.
	+ */
	+ ctrlr->quirks \|= QUIRK_AHCI;
	+
	+ return (nvme_attach(dev)); /* Note: failure frees resources */
	bad:
	if (ctrlr->resource != NULL) {
	bus_release_resource(dev, SYS_RES_MEMORY,
	diff --git a/sys/dev/nvme/nvme_private.h b/sys/dev/nvme/nvme_private.h
	--- a/sys/dev/nvme/nvme_private.h
	+++ b/sys/dev/nvme/nvme_private.h
	@@ -241,6 +241,7 @@
	#define QUIRK_DELAY_B4_CHK_RDY 1 /* Can't touch MMIO on disable */
	#define QUIRK_DISABLE_TIMEOUT 2 /* Disable broken completion timeout feature */
	#define QUIRK_INTEL_ALIGNMENT 4 /* Pre NVMe 1.3 performance alignment */
	+#define QUIRK_AHCI 8 /* Attached via AHCI redirect */

	bus_space_tag_t bus_tag;
	bus_space_handle_t bus_handle;