diff --git a/lib/OptimizationMOI/src/OptimizationMOI.jl b/lib/OptimizationMOI/src/OptimizationMOI.jl
index 72ae90165..5655eed01 100644
--- a/lib/OptimizationMOI/src/OptimizationMOI.jl
+++ b/lib/OptimizationMOI/src/OptimizationMOI.jl
@@ -15,8 +15,6 @@ using LinearAlgebra
 
 const MOI = MathOptInterface
 
-const DenseOrSparse{T} = Union{Matrix{T}, SparseMatrixCSC{T}}
-
 function SciMLBase.requiresgradient(opt::Union{
         MOI.AbstractOptimizer, MOI.OptimizerWithAttributes})
     true
diff --git a/lib/OptimizationMOI/src/nlp.jl b/lib/OptimizationMOI/src/nlp.jl
index 099a8c70a..bb5261336 100644
--- a/lib/OptimizationMOI/src/nlp.jl
+++ b/lib/OptimizationMOI/src/nlp.jl
@@ -1,7 +1,5 @@
 mutable struct MOIOptimizationNLPEvaluator{T, F <: OptimizationFunction, RC, LB, UB,
-    I,
-    JT <: DenseOrSparse{T}, HT <: DenseOrSparse{T},
-    CHT <: DenseOrSparse{T}, S, CB} <:
+    I, JT <: AbstractMatrix{T}, HT <: AbstractMatrix{T}, CHT <: AbstractMatrix{T}, S, CB} <:
                MOI.AbstractNLPEvaluator
     f::F
     reinit_cache::RC