diff --git a/test/unit_test/static/math_test.cpp b/test/unit_test/static/math_test.cpp
index 5de148f7..364c1355 100644
--- a/test/unit_test/static/math_test.cpp
+++ b/test/unit_test/static/math_test.cpp
@@ -23,7 +23,9 @@
 #include "units/math.h"
 #include "test_tools.h"
 #include "units/physical/si/derived/area.h"
+#include "units/physical/si/derived/volume.h"
 #include "units/physical/si/international/derived/area.h"
+#include "units/physical/si/international/derived/volume.h"
 
 namespace {