diff --git a/oldbloom/bloom.cpp b/oldbloom/bloom.cpp
index 623989c..0b870e6 100644
--- a/oldbloom/bloom.cpp
+++ b/oldbloom/bloom.cpp
@@ -77,13 +77,10 @@ static int oldbloom_check_add(struct oldbloom * bloom, const void * buffer, int
 	r = oldtest_bit_set_bit(bloom->bf, x, add);
 	ReleaseMutex(bloom->mutex);
 #else
-	pthread_mutex_lock(&bloom->mutex);
+	pthread_mutex_lock((pthread_mutex_t*)&bloom->mutex);
 	r = oldtest_bit_set_bit(bloom->bf, x, add);
-	pthread_mutex_unlock(&bloom->mutex);
+	pthread_mutex_unlock((pthread_mutex_t*)&bloom->mutex);
 #endif
-	
-	
-	pthread_mutex_unlock(&bloom->mutex);
     if (r) {
       hits++;
     } else if (!add) {