diff --git a/sys/dev/iwm/if_iwm.c b/sys/dev/iwm/if_iwm.c
index 496dfb12b3f1..9053b26fd282 100644
--- a/sys/dev/iwm/if_iwm.c
+++ b/sys/dev/iwm/if_iwm.c
@@ -1025,7 +1025,7 @@ iwm_alloc_fwmem(struct iwm_softc *sc)
 {
 	/* Must be aligned on a 16-byte boundary. */
 	return iwm_dma_contig_alloc(sc->sc_dmat, &sc->fw_dma,
-	    sc->sc_fwdmasegsz, 16);
+	    IWM_FH_MEM_TB_MAX_LENGTH, 16);
 }
 
 /* tx scheduler rings.  not used? */
@@ -5997,27 +5997,22 @@ iwm_dev_check(device_t dev)
 	case PCI_PRODUCT_INTEL_WL_3160_1:
 	case PCI_PRODUCT_INTEL_WL_3160_2:
 		sc->cfg = &iwm3160_cfg;
-		sc->sc_fwdmasegsz = IWM_FWDMASEGSZ;
 		return (0);
 	case PCI_PRODUCT_INTEL_WL_3165_1:
 	case PCI_PRODUCT_INTEL_WL_3165_2:
 		sc->cfg = &iwm3165_cfg;
-		sc->sc_fwdmasegsz = IWM_FWDMASEGSZ;
 		return (0);
 	case PCI_PRODUCT_INTEL_WL_7260_1:
 	case PCI_PRODUCT_INTEL_WL_7260_2:
 		sc->cfg = &iwm7260_cfg;
-		sc->sc_fwdmasegsz = IWM_FWDMASEGSZ;
 		return (0);
 	case PCI_PRODUCT_INTEL_WL_7265_1:
 	case PCI_PRODUCT_INTEL_WL_7265_2:
 		sc->cfg = &iwm7265_cfg;
-		sc->sc_fwdmasegsz = IWM_FWDMASEGSZ;
 		return (0);
 	case PCI_PRODUCT_INTEL_WL_8260_1:
 	case PCI_PRODUCT_INTEL_WL_8260_2:
 		sc->cfg = &iwm8260_cfg;
-		sc->sc_fwdmasegsz = IWM_FWDMASEGSZ_8000;
 		return (0);
 	default:
 		device_printf(dev, "unknown adapter type\n");
diff --git a/sys/dev/iwm/if_iwmvar.h b/sys/dev/iwm/if_iwmvar.h
index e8cbb4b091b5..ad6e3754bf89 100644
--- a/sys/dev/iwm/if_iwmvar.h
+++ b/sys/dev/iwm/if_iwmvar.h
@@ -138,10 +138,6 @@ struct iwm_tx_radiotap_header {
 
 
 #define IWM_UCODE_SECTION_MAX 16
-#define IWM_FWDMASEGSZ (192*1024)
-#define IWM_FWDMASEGSZ_8000 (320*1024)
-/* sanity check value */
-#define IWM_FWMAXSIZE (2*1024*1024)
 
 /*
  * fw_status is used to determine if we've already parsed the firmware file
@@ -476,7 +472,6 @@ struct iwm_softc {
 	 */
 	int			sc_generation;
 
-	bus_size_t		sc_fwdmasegsz;
 	struct iwm_fw_info	sc_fw;
 	struct iwm_tlv_calib_ctrl sc_default_calib[IWM_UCODE_TYPE_MAX];