--- mibdisk.c.org	2016-03-12 16:51:53.000000000 +0900
+++ mibdisk.c	2019-05-22 00:13:43.303064000 +0900
@@ -287,7 +287,7 @@
 		break;
 
 	case LEAF_dskAvailLow:
-		value->v.uint32 = dp->avail & INT32_MAX;
+		value->v.uint32 = dp->avail & UINT32_MAX;
 		break;
 
 	case LEAF_dskAvailHigh:
@@ -302,7 +302,7 @@
 		break;
 
 	case LEAF_dskUsedLow:
-		value->v.uint32 = dp->used & INT32_MAX;
+		value->v.uint32 = dp->used & UINT32_MAX;
 		break;
 
 	case LEAF_dskUsedHigh: