diff --git a/briar-core/src/org/briarproject/crypto/CryptoComponentImpl.java b/briar-core/src/org/briarproject/crypto/CryptoComponentImpl.java
index 89b2d3dbca704586a61dd0ce0d85170d1935ec20..53507da122fdfa94bdec8d11ff52ace9548ac634 100644
--- a/briar-core/src/org/briarproject/crypto/CryptoComponentImpl.java
+++ b/briar-core/src/org/briarproject/crypto/CryptoComponentImpl.java
@@ -171,7 +171,7 @@ class CryptoComponentImpl implements CryptoComponent {
 	}
 
 	public int generateInvitationCode() {
-		int codeBytes = (int) Math.ceil(CODE_BITS / 8.0);
+		int codeBytes = (CODE_BITS + 7) / 8;
 		byte[] random = new byte[codeBytes];
 		secureRandom.nextBytes(random);
 		return ByteUtils.readUint(random, CODE_BITS);