diff --git a/sys/dev/pms/freebsd/driver/ini/src/agdef.h b/sys/dev/pms/freebsd/driver/ini/src/agdef.h
index 4c2ba2867f5f..b58741a434c7 100644
--- a/sys/dev/pms/freebsd/driver/ini/src/agdef.h
+++ b/sys/dev/pms/freebsd/driver/ini/src/agdef.h
@@ -62,7 +62,7 @@ EW     09-17-2004     1.0.0     Constant definitions
 #define AGTIAPI_MAX_DEVICE_7H       256 /*Max devices per channel in 7H */
 #define AGTIAPI_MAX_DEVICE_8H       512 /*Max devices per channel in 8H*/
 #define AGTIAPI_MAX_CAM_Q_DEPTH     1024
-#define AGTIAPI_NSEGS               (btoc(maxphys) + 1)
+#define AGTIAPI_NSEGS               (MIN(btoc(maxphys), 64) + 1)
 /*
 ** Adapter specific defines 
 */
diff --git a/sys/dev/pms/freebsd/driver/ini/src/agtiapi.c b/sys/dev/pms/freebsd/driver/ini/src/agtiapi.c
index 4ce32d0ce6c0..a2b20c9e9264 100644
--- a/sys/dev/pms/freebsd/driver/ini/src/agtiapi.c
+++ b/sys/dev/pms/freebsd/driver/ini/src/agtiapi.c
@@ -1834,7 +1834,7 @@ static void agtiapi_cam_action( struct cam_sim *sim, union ccb * ccb )
     cpi->max_target = maxTargets - 1;
     cpi->max_lun = AGTIAPI_MAX_LUN;
     /* Max supported I/O size, in bytes. */
-    cpi->maxio = ulmin(1024 * 1024, maxphys);
+    cpi->maxio = ctob(AGTIAPI_NSEGS - 1);
     cpi->initiator_id = 255;
     strlcpy(cpi->sim_vid, "FreeBSD", SIM_IDLEN);
     strlcpy(cpi->hba_vid, "PMC", HBA_IDLEN);