diff --git a/include/vectorwrapper/sequence_bt.hpp b/include/vectorwrapper/sequence_bt.hpp
index 302cefe..8ba2cc8 100644
--- a/include/vectorwrapper/sequence_bt.hpp
+++ b/include/vectorwrapper/sequence_bt.hpp
@@ -19,6 +19,10 @@
 
 #include <cstddef>
 
+#if defined VWR_OUTER_NAMESPACE
+namespace VWR_OUTER_NAMESPACE {
+#endif
+
 namespace vwr {
 	namespace bt {
 		template <typename T, T... I>
@@ -50,4 +54,8 @@ namespace vwr {
 	} //namespace bt
 } //namespace vwr
 
+#if defined VWR_OUTER_NAMESPACE
+} //namespace VWR_OUTER_NAMESPACE
+#endif
+
 #endif
diff --git a/include/vectorwrapper/size_type.hpp b/include/vectorwrapper/size_type.hpp
index 28fc265..7e51705 100644
--- a/include/vectorwrapper/size_type.hpp
+++ b/include/vectorwrapper/size_type.hpp
@@ -22,6 +22,10 @@
 #	include <cstdint>
 #endif
 
+#if defined VWR_OUTER_NAMESPACE
+namespace VWR_OUTER_NAMESPACE {
+#endif
+
 namespace vwr {
 #if !defined(VWR_SIZE_TYPE)
 	typedef std::size_t size_type;
@@ -30,4 +34,8 @@ namespace vwr {
 #endif
 } //namespace vwr
 
+#if defined VWR_OUTER_NAMESPACE
+} //namespace VWR_OUTER_NAMESPACE
+#endif
+
 #endif
diff --git a/include/vectorwrapper/vector_cast.hpp b/include/vectorwrapper/vector_cast.hpp
index 18b5d15..d411eca 100644
--- a/include/vectorwrapper/vector_cast.hpp
+++ b/include/vectorwrapper/vector_cast.hpp
@@ -21,6 +21,10 @@
 #include "vectorwrapper/size_type.hpp"
 #include "vectorwrapper/vectorwrapper.hpp"
 
+#if defined VWR_OUTER_NAMESPACE
+namespace VWR_OUTER_NAMESPACE {
+#endif
+
 namespace vwr {
 	namespace implem {
 		template <typename TO, typename FROM, size_type... I>
@@ -43,4 +47,8 @@ namespace vwr {
 	}
 } //namespace vwr
 
+#if defined VWR_OUTER_NAMESPACE
+} //namespace VWR_OUTER_NAMESPACE
+#endif
+
 #endif
diff --git a/include/vectorwrapper/vectorops.hpp b/include/vectorwrapper/vectorops.hpp
index 50c9c60..bcd3fd7 100644
--- a/include/vectorwrapper/vectorops.hpp
+++ b/include/vectorwrapper/vectorops.hpp
@@ -22,6 +22,10 @@
 #include <type_traits>
 #include <cstddef>
 
+#if defined VWR_OUTER_NAMESPACE
+namespace VWR_OUTER_NAMESPACE {
+#endif
+
 namespace vwr {
 	template <typename V1, typename V2, size_type S>
 	typename std::common_type<typename Vec<V1>::scalar_type, typename Vec<V2>::scalar_type>::type dot ( const Vec<V1, S>& parLeft, const Vec<V2, S>& parRight );
@@ -54,4 +58,8 @@ namespace vwr {
 	}
 } //namespace vwr
 
+#if defined VWR_OUTER_NAMESPACE
+} //namespace VWR_OUTER_NAMESPACE
+#endif
+
 #endif
diff --git a/include/vectorwrapper/vectorwrapper.hpp b/include/vectorwrapper/vectorwrapper.hpp
index 5b7e364..abe2b84 100644
--- a/include/vectorwrapper/vectorwrapper.hpp
+++ b/include/vectorwrapper/vectorwrapper.hpp
@@ -25,6 +25,10 @@
 #include <array>
 #include <cassert>
 
+#if defined VWR_OUTER_NAMESPACE
+namespace VWR_OUTER_NAMESPACE {
+#endif
+
 namespace vwr {
 	template <typename V>
 	struct VectorWrapperInfo;
@@ -485,6 +489,10 @@ namespace vwr {
 	Vec<V> operator% ( const typename Vec<V>::scalar_type& parLeft, const Vec<V>& parRight );
 } //namespace vwr
 
+#if defined VWR_OUTER_NAMESPACE
+} //namespace VWR_OUTER_NAMESPACE
+#endif
+
 #include "vectorwrapper/vectorwrapper.inl"
 
 #endif
diff --git a/include/vectorwrapper/vectorwrapper.inl b/include/vectorwrapper/vectorwrapper.inl
index 2ca67b5..5a29b9e 100644
--- a/include/vectorwrapper/vectorwrapper.inl
+++ b/include/vectorwrapper/vectorwrapper.inl
@@ -14,6 +14,10 @@
  * limitations under the License.
  */
 
+#if defined VWR_OUTER_NAMESPACE
+namespace VWR_OUTER_NAMESPACE {
+#endif
+
 namespace vwr {
 	namespace implem {
 		template <typename T, bool=HasCastIgnoreTrailingPropertiesEnum<VectorWrapperInfo<T>>::value> struct IsCastIgnoreTrailingPropertiesSet;
@@ -611,3 +615,7 @@ namespace vwr {
 		);
 	}
 } //namespace vwr
+
+#if defined VWR_OUTER_NAMESPACE
+} //namespace VWR_OUTER_NAMESPACE
+#endif
diff --git a/test/unit_noconv/CMakeLists.txt b/test/unit_noconv/CMakeLists.txt
index bb77de5..559379a 100644
--- a/test/unit_noconv/CMakeLists.txt
+++ b/test/unit_noconv/CMakeLists.txt
@@ -22,3 +22,7 @@ add_test(
 	WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
 	COMMAND ${PROJECT_NAME}
 )
+
+target_compile_definitions(${PROJECT_NAME}
+	PRIVATE VWR_OUTER_NAMESPACE=vwr_outer_ns
+)
diff --git a/test/unit_noconv/sample_vector.hpp b/test/unit_noconv/sample_vector.hpp
index ebdf020..77e83a2 100644
--- a/test/unit_noconv/sample_vector.hpp
+++ b/test/unit_noconv/sample_vector.hpp
@@ -15,6 +15,7 @@
         } \
     }
 
+namespace vwr_outer_ns {
 namespace vwr {
 	SPECIALIZE_ARRAY_VECTOR(float, 2);
 	SPECIALIZE_ARRAY_VECTOR(float, 3);
@@ -26,6 +27,7 @@ namespace vwr {
 	typedef Vec<std::array<short int, 2>> short2;
 	typedef Vec<std::array<short int, 3>> short3;
 } //namespace vwr
+} //namespace vwr_outer_ns
 
 #undef SPECIALIZE_ARRAY_VECTOR
 
diff --git a/test/unit_noconv/test_conversions.cpp b/test/unit_noconv/test_conversions.cpp
index 0ecc196..5c59044 100644
--- a/test/unit_noconv/test_conversions.cpp
+++ b/test/unit_noconv/test_conversions.cpp
@@ -3,7 +3,7 @@
 #include <gtest/gtest.h>
 
 TEST(vwr, vector_cast) {
-	using namespace vwr;
+	using namespace vwr_outer_ns::vwr;
 
 	{
 		float2 v1(1.0f, 2.0f);
@@ -39,7 +39,7 @@ TEST(vwr, vector_cast) {
 }
 
 TEST(vwr, promotion_static_cast) {
-	using namespace vwr;
+	using namespace vwr_outer_ns::vwr;
 
 	{
 		short2 v1(100, 200);