diff --git a/src/initialization.jl b/src/initialization.jl
index 778843382..605300a61 100644
--- a/src/initialization.jl
+++ b/src/initialization.jl
@@ -23,7 +23,7 @@ struct OverrideInitData{IProb, UIProb, IProbMap, IProbPmap}
     """
     initializeprobmap::IProbMap
     """
-    A function which takes the solution of `initializeprob` and returns
+    A function which takes `value_provider` and the solution of `initializeprob` and returns
     the parameter object of the original problem. If absent (`nothing`),
     this will not be called and the parameters of the problem being
     initialized will be returned as-is.
@@ -210,7 +210,7 @@ function get_initial_values(prob, valp, f, alg::OverrideInit,
 
     u0 = initdata.initializeprobmap(nlsol)
     if initdata.initializeprobpmap !== nothing
-        p = initdata.initializeprobpmap(nlsol)
+        p = initdata.initializeprobpmap(valp, nlsol)
     end
 
     return u0, p, SciMLBase.successful_retcode(nlsol)
diff --git a/test/downstream/initialization.jl b/test/downstream/initialization.jl
index a7d5ee671..6ff062811 100644
--- a/test/downstream/initialization.jl
+++ b/test/downstream/initialization.jl
@@ -1,4 +1,4 @@
-using OrdinaryDiffEq, Sundials, SciMLBase, Test
+using ModelingToolkit, NonlinearSolve, OrdinaryDiffEq, Sundials, SciMLBase, Test
 
 @testset "CheckInit" begin
     abstol = 1e-10
@@ -59,3 +59,26 @@ using OrdinaryDiffEq, Sundials, SciMLBase, Test
         end
     end
 end
+
+@testset "OverrideInit with MTK" begin
+    abstol = 1e-10
+    reltol = 1e-8
+
+    @variables x(t) [guess = 1.0] y(t) [guess = 1.0]
+    @parameters p=missing [guess = 1.0] q=missing [guess = 1.0]
+    @mtkbuild sys = ODESystem([D(x) ~ p * y + q * t, D(y) ~ 5x + q], t;
+        initialization_eqs = [p^2 + q^2 ~ 3, x^3 + y^3 ~ 5])
+    prob = ODEProblem(
+        sys, [x => 1.0], (0.0, 1.0), [p => 1.0]; initializealg = SciMLBase.NoInit())
+
+    @test prob.f.initialization_data isa SciMLBase.OverrideInitData
+    integ = init(prob, Tsit5())
+    u0, pobj, success = SciMLBase.get_initial_values(
+        prob, integ, prob.f, SciMLBase.OverrideInit(), Val(true);
+        nlsolve_alg = NewtonRaphson(), abstol, reltol)
+
+    @test getu(sys, x)(u0) ≈ 1.0
+    @test getu(sys, y)(u0) ≈ cbrt(4)
+    @test getp(sys, p)(pobj) ≈ 1.0
+    @test getp(sys, q)(pobj) ≈ sqrt(2)
+end