diff --git a/Project.toml b/Project.toml
index 5e36a090..ac09c34a 100644
--- a/Project.toml
+++ b/Project.toml
@@ -79,4 +79,4 @@ Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
 Zygote = "e88e6eb3-aa80-5325-afca-941959d7151f"
 
 [targets]
-test = ["Test", "BandedMatrices", "BlockBandedMatrices", "Enzyme", "IterativeSolvers", "Pkg", "Random", "SafeTestsets", "Symbolics", "Zygote", "StaticArrays", "PolyesterForwardDiff"]
+test = ["Test", "BandedMatrices", "BlockBandedMatrices", "Enzyme", "IterativeSolvers", "Pkg", "Random", "SafeTestsets", "Symbolics", "Zygote", "StaticArrays"]
diff --git a/test/1.9specific/Project.toml b/test/1.9specific/Project.toml
new file mode 100644
index 00000000..c151568d
--- /dev/null
+++ b/test/1.9specific/Project.toml
@@ -0,0 +1,3 @@
+[deps]
+AllocCheck = "9b6a8646-10ed-4001-bbdc-1d2f46dfbb1a"
+PolyesterForwardDiff = "98d1487c-24ca-40b6-b7ab-df2af84e126b"
diff --git a/test/allocs/Project.toml b/test/allocs/Project.toml
deleted file mode 100644
index 2ce39fac..00000000
--- a/test/allocs/Project.toml
+++ /dev/null
@@ -1,2 +0,0 @@
-[deps]
-AllocCheck = "9b6a8646-10ed-4001-bbdc-1d2f46dfbb1a"
diff --git a/test/runtests.jl b/test/runtests.jl
index 52b53f92..38085bb0 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -42,7 +42,7 @@ if GROUP == "Core" || GROUP == "All"
 end
 
 if GROUP == "InterfaceI" || GROUP == "All"
-    VERSION ≥ v"1.9" && activate_env("allocs")
+    VERSION ≥ v"1.9" && activate_env("1.9specific")
     @time @safetestset "Jac Vecs and Hes Vecs" begin
         include("test_jaches_products.jl")
     end
diff --git a/test/test_sparse_jacobian.jl b/test/test_sparse_jacobian.jl
index 2b0bb4fa..395604c5 100644
--- a/test/test_sparse_jacobian.jl
+++ b/test/test_sparse_jacobian.jl
@@ -1,6 +1,22 @@
 ## Sparse Jacobian tests
-using SparseDiffTools, PolyesterForwardDiff, Symbolics, ForwardDiff, LinearAlgebra,
-    SparseArrays, Zygote, Enzyme, Test, StaticArrays
+using SparseDiffTools,
+    Symbolics, ForwardDiff, LinearAlgebra, SparseArrays, Zygote, Enzyme, Test, StaticArrays
+
+@static if VERSION ≥ v"1.9"
+    using PolyesterForwardDiff
+end
+
+function __chunksize(::Union{AutoSparseForwardDiff{C}, AutoForwardDiff{C},
+        AutoSparsePolyesterForwardDiff{C}, AutoPolyesterForwardDiff{C}}) where {C}
+    return C
+end
+
+function __isinferrable(difftype)
+    return !(difftype isa AutoSparseForwardDiff || difftype isa AutoForwardDiff ||
+             difftype isa AutoSparsePolyesterForwardDiff ||
+             difftype isa AutoPolyesterForwardDiff) ||
+           (__chunksize(difftype) isa Int && __chunksize(difftype) > 0)
+end
 
 @views function fdiff(y, x) # in-place
     L = length(x)
@@ -38,16 +54,22 @@ SPARSITY_DETECTION_ALGS = [JacPrototypeSparsityDetection(; jac_prototype = J_spa
         @info "Sparsity Detection: $(nameof(typeof(sd)))"
         @info "Out of Place Function"
 
-        @testset "sparse_jacobian $(nameof(typeof(difftype))): Out of Place" for difftype in (AutoSparseZygote(),
-            AutoZygote(), AutoSparseForwardDiff(), AutoForwardDiff(),
-            AutoSparseForwardDiff(; chunksize = 0), AutoForwardDiff(; chunksize = 0),
-            AutoSparseForwardDiff(; chunksize = 4), AutoForwardDiff(; chunksize = 4),
-            AutoSparsePolyesterForwardDiff(), AutoPolyesterForwardDiff(),
-            AutoSparsePolyesterForwardDiff(; chunksize = 0),
-            AutoPolyesterForwardDiff(; chunksize = 0),
-            AutoSparsePolyesterForwardDiff(; chunksize = 4),
-            AutoPolyesterForwardDiff(; chunksize = 4), AutoSparseFiniteDiff(),
-            AutoFiniteDiff(), AutoEnzyme(), AutoSparseEnzyme())
+        DIFFTYPES = [AutoSparseZygote(), AutoZygote(), AutoSparseForwardDiff(),
+            AutoForwardDiff(), AutoSparseForwardDiff(; chunksize = 0),
+            AutoForwardDiff(; chunksize = 0), AutoSparseForwardDiff(; chunksize = 4),
+            AutoForwardDiff(; chunksize = 4), AutoSparseFiniteDiff(), AutoFiniteDiff(),
+            AutoEnzyme(), AutoSparseEnzyme()]
+
+        if VERSION ≥ v"1.9"
+            append!(DIFFTYPES,
+                [AutoSparsePolyesterForwardDiff(), AutoPolyesterForwardDiff(),
+                    AutoSparsePolyesterForwardDiff(; chunksize = 0),
+                    AutoPolyesterForwardDiff(; chunksize = 0),
+                    AutoSparsePolyesterForwardDiff(; chunksize = 4),
+                    AutoPolyesterForwardDiff(; chunksize = 4)])
+        end
+
+        @testset "sparse_jacobian $(nameof(typeof(difftype))): Out of Place" for difftype in DIFFTYPES
             @testset "Cache & Reuse" begin
                 cache = sparse_jacobian_cache(difftype, sd, fdiff, x)
                 J = init_jacobian(cache)
@@ -64,9 +86,7 @@ SPARSITY_DETECTION_ALGS = [JacPrototypeSparsityDetection(; jac_prototype = J_spa
 
                 @test J ≈ J_true
 
-                if !(difftype isa AutoSparseForwardDiff || difftype isa AutoForwardDiff ||
-                     difftype isa AutoSparsePolyesterForwardDiff ||
-                     difftype isa AutoPolyesterForwardDiff)
+                if __isinferrable(difftype)
                     @inferred sparse_jacobian(difftype, cache, fdiff, x)
                 end
 
@@ -78,9 +98,7 @@ SPARSITY_DETECTION_ALGS = [JacPrototypeSparsityDetection(; jac_prototype = J_spa
                 J = sparse_jacobian(difftype, sd, fdiff, x)
 
                 @test J ≈ J_true
-                if !(difftype isa AutoSparseForwardDiff || difftype isa AutoForwardDiff ||
-                     difftype isa AutoSparsePolyesterForwardDiff ||
-                     difftype isa AutoPolyesterForwardDiff)
+                if __isinferrable(difftype)
                     @inferred sparse_jacobian(difftype, sd, fdiff, x)
                 end
 
@@ -123,9 +141,7 @@ SPARSITY_DETECTION_ALGS = [JacPrototypeSparsityDetection(; jac_prototype = J_spa
                 J = sparse_jacobian(difftype, cache, fdiff, y, x)
 
                 @test J ≈ J_true
-                if !(difftype isa AutoSparseForwardDiff || difftype isa AutoForwardDiff ||
-                     difftype isa AutoSparsePolyesterForwardDiff ||
-                     difftype isa AutoPolyesterForwardDiff)
+                if __isinferrable(difftype)
                     @inferred sparse_jacobian(difftype, cache, fdiff, y, x)
                 end
 
@@ -137,9 +153,7 @@ SPARSITY_DETECTION_ALGS = [JacPrototypeSparsityDetection(; jac_prototype = J_spa
                 J = sparse_jacobian(difftype, sd, fdiff, y, x)
 
                 @test J ≈ J_true
-                if !(difftype isa AutoSparseForwardDiff || difftype isa AutoForwardDiff ||
-                     difftype isa AutoSparsePolyesterForwardDiff ||
-                     difftype isa AutoPolyesterForwardDiff)
+                if __isinferrable(difftype)
                     @inferred sparse_jacobian(difftype, sd, fdiff, y, x)
                 end