diff --git a/cmds-fi-usage.c b/cmds-fi-usage.c
index 23820066..b26ece1d 100644
--- a/cmds-fi-usage.c
+++ b/cmds-fi-usage.c
@@ -1024,13 +1024,8 @@ void print_device_sizes(int fd, struct device_info *devinfo, unsigned unit_mode)
 	printf("   Device size: %*s%10s\n",
 		(int)(20 - strlen("Device size")), "",
 		pretty_size_mode(devinfo->device_size, unit_mode));
-#if 0
-	/*
-	 * The term has not seen an agreement and we don't want to change it
-	 * once it's in non-development branches or even released.
-	 */
-	printf("   FS occupied: %*s%10s\n",
-		(int)(20 - strlen("FS occupied")), "",
-		pretty_size_mode(devinfo->size, unit_mode));
-#endif
+	printf("   Device slack: %*s%10s\n",
+		(int)(20 - strlen("Device slack")), "",
+		pretty_size_mode(devinfo->device_size - devinfo->size,
+			unit_mode));
 }