diff --git a/src/main/java/fr/xephi/authme/security/crypts/Whirlpool.java b/src/main/java/fr/xephi/authme/security/crypts/Whirlpool.java
index 7c62b261..1a450d56 100644
--- a/src/main/java/fr/xephi/authme/security/crypts/Whirlpool.java
+++ b/src/main/java/fr/xephi/authme/security/crypts/Whirlpool.java
@@ -308,7 +308,7 @@ public class Whirlpool extends UnsaltedMethod {
         if (bufferRem + sourceBits < 8) {
             // all remaining data fits on buffer[bufferPos], and there still
             // remains some space.
-            bufferBits += sourceBits;
+            bufferBits += (int) sourceBits;
         } else {
             // buffer[bufferPos] is full:
             bufferPos++;