diff --git a/dune/gdt/spaces/product.hh b/dune/gdt/spaces/product.hh
index ebe28fcbd041ffebb63f6a163c7558f4d0716282..5d06145dea7816fa4bae19dcfcdee1b2da2ce919 100644
--- a/dune/gdt/spaces/product.hh
+++ b/dune/gdt/spaces/product.hh
@@ -21,7 +21,6 @@
 
 namespace Dune {
 namespace GDT {
-namespace Spaces {
 
 
 template <class... SpaceImps>
@@ -185,7 +184,6 @@ private:
 }; // class DefaultProductSpace
 
 
-} // namespace Spaces
 } // namespace GDT
 } // namespace Dune