diff --git a/common.h b/common.h
index 6c3d5b15e..d365ba8f4 100644
--- a/common.h
+++ b/common.h
@@ -208,6 +208,7 @@ extern "C" {
 #undef	USE_PTHREAD_SPINLOCK
 #endif
 
+
 #if   defined(USE_PTHREAD_LOCK)
 #define   LOCK_COMMAND(x)   pthread_mutex_lock(x)
 #define UNLOCK_COMMAND(x)   pthread_mutex_unlock(x)