diff --git a/src/main/kotlin/ru/dbotthepony/kstarbound/io/StarboundPak.kt b/src/main/kotlin/ru/dbotthepony/kstarbound/io/StarboundPak.kt
index 9d4a5716..2a90f9fa 100644
--- a/src/main/kotlin/ru/dbotthepony/kstarbound/io/StarboundPak.kt
+++ b/src/main/kotlin/ru/dbotthepony/kstarbound/io/StarboundPak.kt
@@ -194,6 +194,7 @@ class StarboundPak(val path: File, callback: (finished: Boolean, status: String)
 		// long (offset от начала файла)
 		// long (длина файла)
 		val stream = DataInputStream(BufferedInputStream(Channels.newInputStream(reader.channel), 2 shl 22))
+		val flength = reader.length()
 
 		for (i in 0 until indexNodeCount) {
 			var name: String? = null
@@ -207,11 +208,11 @@ class StarboundPak(val path: File, callback: (finished: Boolean, status: String)
 				val offset = stream.readLong()
 				val length = stream.readLong()
 
-				if (offset > reader.length()) {
+				if (offset > flength) {
 					throw IndexOutOfBoundsException("Garbage offset at index $i: ${offset}")
 				}
 
-				if (length + offset > reader.length()) {
+				if (length + offset > flength) {
 					throw IndexOutOfBoundsException("Garbage offset + length at index $i: ${length + offset}")
 				}