diff --git a/.github/workflows/Downstream.yml b/.github/workflows/Downstream.yml
index 0854c0e04..4afc74b32 100644
--- a/.github/workflows/Downstream.yml
+++ b/.github/workflows/Downstream.yml
@@ -43,6 +43,11 @@ jobs:
           - {user: SciML, repo: StochasticDelayDiffEq.jl, group: All}
           - {user: SciML, repo: SimpleNonlinearSolve.jl, group: All}
           - {user: SciML, repo: SimpleDiffEq.jl, group: All}
+          - {user: SciML, repo: SciMLSensitivity.jl, group: Core1}
+          - {user: SciML, repo: SciMLSensitivity.jl, group: Core2}
+          - {user: SciML, repo: SciMLSensitivity.jl, group: Core3}
+          - {user: SciML, repo: SciMLSensitivity.jl, group: Core4}
+          - {user: SciML, repo: SciMLSensitivity.jl, group: Core5}
 
     steps:
       - uses: actions/checkout@v4
diff --git a/Project.toml b/Project.toml
index 2aba2b87b..0d085b4e1 100644
--- a/Project.toml
+++ b/Project.toml
@@ -12,6 +12,7 @@ ConstructionBase = "187b0558-2788-49d3-abe0-74a17ed4e7c9"
 Distributed = "8ba89e20-285c-5b6f-9357-94700520ee1b"
 DocStringExtensions = "ffbed154-4ef7-542d-bbb7-c09d3a79fcae"
 EnumX = "4e289a0a-7415-4d19-859d-a7e5c4648b56"
+FillArrays = "1a297f60-69ca-5386-bcde-b61e274b549b"
 FunctionWrappersWrappers = "77dc65aa-8811-40c2-897b-53d922fa7daf"
 IteratorInterfaceExtensions = "82899510-4779-5014-852e-03e436cf321d"
 LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"
diff --git a/src/SciMLBase.jl b/src/SciMLBase.jl
index e4d1e371f..a0a9bc900 100644
--- a/src/SciMLBase.jl
+++ b/src/SciMLBase.jl
@@ -23,6 +23,7 @@ import TruncatedStacktraces
 import ADTypes: AbstractADType
 import ChainRulesCore
 import ZygoteRules: @adjoint
+import FillArrays
 
 using Reexport
 using SciMLOperators
diff --git a/src/solutions/zygote.jl b/src/solutions/zygote.jl
index 08090bdbf..d41d07e0f 100644
--- a/src/solutions/zygote.jl
+++ b/src/solutions/zygote.jl
@@ -1,6 +1,6 @@
 @adjoint function getindex(VA::ODESolution, i::Int)
     function ODESolution_getindex_pullback(Δ)
-        Δ′ = [[i == k ? Δ[j] : zero(x[1]) for k in 1:length(x)]
+        Δ′ = [(i == j ? Δ : FillArrays.Fill(zero(eltype(x)), size(x)))
               for (x, j) in zip(VA.u, 1:length(VA))]
         (Δ′, nothing)
     end