diff --git a/alib2std/test-src/extensions/TreeTest.cpp b/alib2std/test-src/extensions/TreeTest.cpp
index 720f87b25f000d27f5de95ea1de770a583c0f917..f4689b0f89e6f9314d644be1929e6784f923cc97 100644
--- a/alib2std/test-src/extensions/TreeTest.cpp
+++ b/alib2std/test-src/extensions/TreeTest.cpp
@@ -1,4 +1,5 @@
 #include "TreeTest.h"
+#include <alib/tuple>
 
 #include <alib/tuple>