diff --git a/lib/OptimizationIpopt/src/OptimizationIpopt.jl b/lib/OptimizationIpopt/src/OptimizationIpopt.jl
index b9056fcec..a877977f3 100644
--- a/lib/OptimizationIpopt/src/OptimizationIpopt.jl
+++ b/lib/OptimizationIpopt/src/OptimizationIpopt.jl
@@ -9,8 +9,6 @@ using SymbolicIndexingInterface
 
 export IpoptOptimizer
 
-const DenseOrSparse{T} = Union{Matrix{T}, SparseMatrixCSC{T}}
-
 """
     IpoptOptimizer(; kwargs...)
 
diff --git a/lib/OptimizationIpopt/src/cache.jl b/lib/OptimizationIpopt/src/cache.jl
index f95b9981b..738af6e2e 100644
--- a/lib/OptimizationIpopt/src/cache.jl
+++ b/lib/OptimizationIpopt/src/cache.jl
@@ -1,6 +1,6 @@
 mutable struct IpoptCache{T, F <: OptimizationFunction, RC, LB, UB, I, S,
-    JT <: DenseOrSparse{T}, HT <: DenseOrSparse{T},
-    CHT <: DenseOrSparse{T}, CB, O} <: SciMLBase.AbstractOptimizationCache
+    JT <: AbstractMatrix{T}, HT <: AbstractMatrix{T},
+    CHT <: AbstractMatrix{T}, CB, O} <: SciMLBase.AbstractOptimizationCache
     const f::F
     const n::Int
     const num_cons::Int