diff --git a/main.c b/main.c
index 70ead8a..f193976 100644
--- a/main.c
+++ b/main.c
@@ -471,6 +471,7 @@ int main(int argc,char **argv)
 	ge_initeightpoint();
 	filters_init();
 
+	setvbuf(stderr,0,_IONBF,0);
 	fout = stdout;
 	pthread_mutex_init(&keysgenerated_mutex, 0);
 	pthread_mutex_init(&fout_mutex, 0);