diff --git a/Project.toml b/Project.toml
index 58c75b8..8b45ec7 100755
--- a/Project.toml
+++ b/Project.toml
@@ -1,6 +1,6 @@
 name = "Vcov"
 uuid = "ec2bfdc2-55df-4fc9-b9ae-4958c2cf2486"
-version = "0.8.0"
+version = "0.8.1"
 
 [deps]
 Combinatorics = "861a8166-3701-5b0c-9a16-15d98fcdc6aa"
diff --git a/src/ranktest.jl b/src/ranktest.jl
index 24ba4bf..51805fe 100644
--- a/src/ranktest.jl
+++ b/src/ranktest.jl
@@ -55,7 +55,7 @@ function ranktest!(X::Matrix{Float64},
         vlab = cholesky!(Hermitian((kronv * kronv') ./ size(X, 1)), check = false)
     else
         K = kron(Gmatrix, Fmatrix)'
-        vcovmodel = Vcov.VcovData(Z, K, X, nothing, size(Z, 1) - dof_small - dof_fes) 
+        vcovmodel = Vcov.VcovData(Z, K, nothing, X, size(Z, 1) - dof_small - dof_fes) 
         matrix_vcov2 = Vcov.S_hat(vcovmodel, vcov_method)
         vhat = K \ (K \ matrix_vcov2)'
         vlab = cholesky!(Hermitian(kronv * vhat * kronv'), check = false)