diff --git a/include/xo/unit/Quantity2_iostream.hpp b/include/xo/unit/Quantity_iostream.hpp
similarity index 100%
rename from include/xo/unit/Quantity2_iostream.hpp
rename to include/xo/unit/Quantity_iostream.hpp
diff --git a/utest/unit.test.cpp b/utest/unit.test.cpp
index ee12a0ed..b364b22a 100644
--- a/utest/unit.test.cpp
+++ b/utest/unit.test.cpp
@@ -1,7 +1,7 @@
 /* @file unit.test.cpp */
 
 #include "xo/unit/unit.hpp"
-#include "xo/unit/Quantity2_iostream.hpp"
+#include "xo/unit/Quantity_iostream.hpp"
 #include "xo/unit/Quantity.hpp"
 #include "xo/unit/scaled_unit_iostream.hpp"
 #include "xo/unit/natural_unit.hpp"