diff --git a/ChangeLog b/ChangeLog
index b36da689c..f88612135 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,8 @@
 2008-11-22	Tobias Doerffel	<tobydox/at/users/dot/sourceforge/dot/net>
 
+	* src/core/mixer.cpp:
+	fixed compilation on x86_64
+
 	* src/core/automatable_model.cpp:
 	fixed wrong logic in automatableModel::setValue() which led to bugs when
 	changing linked controls to 0
diff --git a/src/core/mixer.cpp b/src/core/mixer.cpp
index 2fb71ca33..e99d5a3da 100644
--- a/src/core/mixer.cpp
+++ b/src/core/mixer.cpp
@@ -712,7 +712,7 @@ void mixer::bufferToPort( const sampleFrame * _buf,
 void mixer::clearAudioBuffer( sampleFrame * _ab, const f_cnt_t _frames,
 							const f_cnt_t _offset )
 {
-	if( likely( (int)( _ab+_offset ) % 16 == 0 && _frames % 8 == 0 ) )
+	if( likely( (size_t)( _ab+_offset ) % 16 == 0 && _frames % 8 == 0 ) )
 	{
 		alignedMemClear( _ab+_offset, sizeof( *_ab ) * _frames );
 	}