diff --git a/src/Optimization.jl b/src/Optimization.jl
index b54d2fa03..a5e83efe7 100644
--- a/src/Optimization.jl
+++ b/src/Optimization.jl
@@ -15,7 +15,7 @@ using Logging, ProgressLogging, ConsoleProgressMonitor, TerminalLoggers, Logging
 using ArrayInterface, Base.Iterators, SparseArrays, LinearAlgebra
 using Pkg
 
-import OptimizationBase: instantiate_function
+import OptimizationBase: instantiate_function, OptimizationCache, ReInitCache
 import SciMLBase: OptimizationProblem,
                   OptimizationFunction, ObjSense,
                   MaxSense, MinSense, OptimizationStats
@@ -24,6 +24,6 @@ export ObjSense, MaxSense, MinSense
 include("utils.jl")
 include("state.jl")
 
-export solve, OptimizationCache
+export solve
 
 end # module
diff --git a/src/utils.jl b/src/utils.jl
index 2e5e3b2ad..dec99be7b 100644
--- a/src/utils.jl
+++ b/src/utils.jl
@@ -66,9 +66,3 @@ function check_pkg_version(pkg::String, ver::String;
            pkg_info[pkg].version >= VersionNumber(ver) :
            pkg_info[pkg].version > VersionNumber(ver)
 end
-
-# Wrapper for fields that may change in `reinit!(cache)` of a cache.
-mutable struct ReInitCache{uType, P}
-    u0::uType
-    p::P
-end