diff --git a/src/ADTypes.jl b/src/ADTypes.jl
index fb63976..7fefb2b 100644
--- a/src/ADTypes.jl
+++ b/src/ADTypes.jl
@@ -35,6 +35,7 @@ export AutoChainRules,
        AutoFiniteDiff,
        AutoFiniteDifferences,
        AutoForwardDiff,
+       AutoModelingToolkit,
        AutoPolyesterForwardDiff,
        AutoReverseDiff,
        AutoSymbolics,
diff --git a/src/legacy.jl b/src/legacy.jl
index 642095a..5784399 100644
--- a/src/legacy.jl
+++ b/src/legacy.jl
@@ -11,4 +11,24 @@
 
 @deprecate AutoSparseZygote() AutoSparse(AutoZygote())
 
-@deprecate AutoModelingToolkit(; kwargs...) AutoSparse(AutoSymbolics())
+function mtk_to_symbolics(obj_sparse::Bool, cons_sparse::Bool)
+    if obj_sparse || cons_sparse
+        return AutoSparse(AutoSymbolics())
+    else
+        return AutoSymbolics()
+    end
+end
+
+function AutoModelingToolkit(obj_sparse::Bool, cons_sparse::Bool)
+    Base.depwarn(
+        "`AutoModelingToolkit(obj_sparse, cons_sparse)` is deprecated, use `AutoSymbolics()` or `AutoSparse(AutoSymbolics())` instead.",
+        :AutoModelingToolkit; force = false)
+    return mtk_to_symbolics(obj_sparse, cons_sparse)
+end
+
+function AutoModelingToolkit(; obj_sparse::Bool = false, cons_sparse::Bool = false)
+    Base.depwarn(
+        "`AutoModelingToolkit(; obj_sparse, cons_sparse)` is deprecated, use `AutoSymbolics()` or `AutoSparse(AutoSymbolics())` instead.",
+        :AutoModelingToolkit; force = false)
+    return mtk_to_symbolics(obj_sparse, cons_sparse)
+end
diff --git a/test/legacy.jl b/test/legacy.jl
index 2a104b4..08f09d9 100644
--- a/test/legacy.jl
+++ b/test/legacy.jl
@@ -1,8 +1,17 @@
-@testset "AutoModelingToolkig" begin
-    ad = @test_deprecated AutoModelingToolkit()
-    @test ad isa AbstractADType
-    @test ad isa AutoSparse
-    @test dense_ad(ad) isa AutoSymbolics
+@testset "AutoModelingToolkit" begin
+    ad_sparse1 = @test_deprecated AutoModelingToolkit(;
+        obj_sparse = true, cons_sparse = false)
+    ad_sparse2 = @test_deprecated AutoModelingToolkit(true, false)
+
+    ad_dense1 = @test_deprecated AutoModelingToolkit(;
+        obj_sparse = false, cons_sparse = false)
+    ad_dense2 = @test_deprecated AutoModelingToolkit(false, false)
+    ad_dense3 = @test_deprecated AutoModelingToolkit()
+
+    @test all(
+        isa.((ad_sparse1, ad_sparse2, ad_dense1, ad_dense2, ad_dense3), AbstractADType))
+    @test all(isa.((ad_sparse1, ad_sparse2), AutoSparse{<:AutoSymbolics}))
+    @test all(isa.((ad_dense1, ad_dense2, ad_dense3), AutoSymbolics))
 end
 
 @testset "AutoSparseFastDifferentiation" begin