diff --git a/tests/includes.h b/tests/includes.h
index 5f4a96b2..5d844a05 100644
--- a/tests/includes.h
+++ b/tests/includes.h
@@ -12,4 +12,5 @@
 
 #include "../include/spdlog/spdlog.h"
 #include "../include/spdlog/sinks/null_sink.h"
+#include "../include/spdlog/sinks/ostream_sink.h"