diff --git a/unsupported/test/splines.cpp b/unsupported/test/splines.cpp
index 1043453dc..a7eb3e0c4 100644
--- a/unsupported/test/splines.cpp
+++ b/unsupported/test/splines.cpp
@@ -11,6 +11,8 @@
 
 #include <unsupported/Eigen/Splines>
 
+namespace Eigen {
+  
 // lets do some explicit instantiations and thus
 // force the compilation of all spline functions...
 template class Spline<double, 2, Dynamic>;
@@ -29,6 +31,8 @@ template class Spline<float, 3, 3>;
 template class Spline<float, 3, 4>;
 template class Spline<float, 3, 5>;
 
+}
+
 Spline<double, 2, Dynamic> closed_spline2d()
 {
   RowVectorXd knots(12);