diff --git a/crypto/src/main/kotlin/org/openrs2/crypto/Whirlpool.kt b/crypto/src/main/kotlin/org/openrs2/crypto/Whirlpool.kt
index 0fbd0335..54a98cb3 100644
--- a/crypto/src/main/kotlin/org/openrs2/crypto/Whirlpool.kt
+++ b/crypto/src/main/kotlin/org/openrs2/crypto/Whirlpool.kt
@@ -281,7 +281,7 @@ public class Whirlpool {
 
             val whirlpool = Whirlpool()
             whirlpool.NESSIEinit()
-            whirlpool.NESSIEadd(source, (len * 8).toLong())
+            whirlpool.NESSIEadd(source, len.toLong() * 8)
 
             val digest = ByteArray(DIGESTBYTES)
             whirlpool.NESSIEfinalize(digest)