diff --git a/sys/dev/iwm/if_iwm.c b/sys/dev/iwm/if_iwm.c
index b89c895efb50..24056676f736 100644
--- a/sys/dev/iwm/if_iwm.c
+++ b/sys/dev/iwm/if_iwm.c
@@ -5946,7 +5946,7 @@ static int
 iwm_pci_attach(device_t dev)
 {
 	struct iwm_softc *sc;
-	int count, error, rid;
+	int count, error, off, rid;
 	uint16_t reg;
 
 	sc = device_get_softc(dev);
@@ -5974,6 +5974,15 @@ iwm_pci_attach(device_t dev)
 	sc->sc_st = rman_get_bustag(sc->sc_mem);
 	sc->sc_sh = rman_get_bushandle(sc->sc_mem);
 
+	if (pci_find_cap(dev, PCIY_MSIX, &off) == 0) {
+		uint32_t msixctrl = pci_read_config(dev, off + PCIR_MSIX_CTRL, 2);
+		device_printf(dev, "msixctrl %#08x\n", msixctrl);
+		if ((msixctrl & PCIM_MSIXCTRL_MSIX_ENABLE) != 0) {
+			msixctrl &= ~PCIM_MSIXCTRL_MSIX_ENABLE;
+			pci_write_config(dev, off + PCIR_MSIX_CTRL, msixctrl, 2);
+		}
+	}
+
 	/* Install interrupt handler. */
 	count = 1;
 	rid = 0;