diff --git a/src/Algebra/VectorSpaces/FVectorSpace.cs b/src/Algebra/VectorSpaces/FVectorSpace.cs
index e13b1ff..6871aa9 100644
--- a/src/Algebra/VectorSpaces/FVectorSpace.cs
+++ b/src/Algebra/VectorSpaces/FVectorSpace.cs
@@ -3,7 +3,7 @@ using Skeleton.Algebra.VectorSpaces;
 
 namespace Skeleton.Algebra;
 
-public partial class CategoryOf<TDimension>
+public static partial class CategoryOf<TDimension>
 {
     public static partial class OnField<TScalar> where TScalar : notnull
     {
diff --git a/src/Algebra/Vectors/FVector.cs b/src/Algebra/Vectors/FVector.cs
index e663ea9..06a42d9 100644
--- a/src/Algebra/Vectors/FVector.cs
+++ b/src/Algebra/Vectors/FVector.cs
@@ -5,7 +5,7 @@ using Skeleton.Algebra.Vectors;
 
 namespace Skeleton.Algebra;
 
-public partial class CategoryOf<TDimension>
+public static partial class CategoryOf<TDimension>
 {
     public static partial class OnField<TScalar>
         where TScalar : notnull