diff --git a/tests/validation/fixtures/HistogramFixture.h b/tests/validation/fixtures/HistogramFixture.h
index 943b2cd..7349bdf 100644
--- a/tests/validation/fixtures/HistogramFixture.h
+++ b/tests/validation/fixtures/HistogramFixture.h
@@ -31,7 +31,7 @@
 #include "tests/IAccessor.h"
 #include "tests/framework/Asserts.h"
 #include "tests/framework/Fixture.h"
-#include "tests/validation/CPP/Histogram.h"
+#include "tests/validation/reference/Histogram.h"
 #include "utils/Utils.h"
 
 #include <random>