Index: rocs/impl/unx/umutex.c
--- rocs/impl/unx/umutex.c.orig
+++ rocs/impl/unx/umutex.c
@@ -94,7 +94,7 @@ Boolean rocs_mutex_wait( iOMutexData o, int t ) {
   if( t == -1 ) {
     rc = pthread_mutex_lock( (pthread_mutex_t*)data->mh );
   }
-  else if( rc = pthread_mutex_trylock( (pthread_mutex_t*)data->mh ) == EBUSY ) {
+  else if( (rc = pthread_mutex_trylock( (pthread_mutex_t*)data->mh )) == EBUSY ) {
     int try = t / 10 + 1;
     do {
       ThreadOp.sleep( 10 );