diff --git a/src/log.c b/src/log.c
index f246bc2..0bad55d 100644
--- a/src/log.c
+++ b/src/log.c
@@ -40,6 +40,7 @@ void log_open(const char *filename)
         log_error = true;
         exit(EXIT_FAILURE);
     }
+    setvbuf(fp, NULL, _IONBF, 0);
 }
 
 void log_write(char c)