diff --git a/Project.toml b/Project.toml
index c102112..6817bce 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,7 +1,7 @@
 name = "SparseArraysBase"
 uuid = "0d5efcca-f356-4864-8770-e1ed8d78f208"
 authors = ["ITensor developers <support@itensor.org> and contributors"]
-version = "0.8.0"
+version = "0.8.1"
 
 [deps]
 Accessors = "7d9f7c33-5ae7-4f3b-8dc6-eff91059b697"
diff --git a/src/abstractsparsearraystyle.jl b/src/abstractsparsearraystyle.jl
index 45bd02c..24c1f08 100644
--- a/src/abstractsparsearraystyle.jl
+++ b/src/abstractsparsearraystyle.jl
@@ -60,7 +60,7 @@ abstract type AbstractSparseArrayStyle <: AbstractArrayStyle end
 function FunctionImplementations.Style(
         style1::AbstractSparseArrayStyle, style2::AbstractSparseArrayStyle
     )
-    return error("Rule not defined.")
+    return SparseArrayStyle()
 end
 function FunctionImplementations.Style(
         style1::AbstractSparseArrayStyle, style2::AbstractArrayStyle
diff --git a/test/Project.toml b/test/Project.toml
index 761f1bb..f625478 100644
--- a/test/Project.toml
+++ b/test/Project.toml
@@ -4,6 +4,7 @@ Aqua = "4c88cf16-eb10-579e-8560-4a9242c79595"
 ArrayLayouts = "4c555306-a7a7-4459-81d9-ec55ddd5c99a"
 Dictionaries = "85a47980-9c8c-11e8-2b9f-f7ca1fa99fb4"
 FillArrays = "1a297f60-69ca-5386-bcde-b61e274b549b"
+FunctionImplementations = "7c7cc465-9c6a-495f-bdd1-f42428e86d0c"
 JLArrays = "27aeb0d3-9eb9-45fb-866b-73c2ecf80fcb"
 LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"
 NamedDimsArrays = "60cbd0c0-df58-4cb7-918c-6f5607b73fde"
diff --git a/test/test_sparse_style.jl b/test/test_sparse_style.jl
new file mode 100644
index 0000000..9463607
--- /dev/null
+++ b/test/test_sparse_style.jl
@@ -0,0 +1,26 @@
+using FunctionImplementations: Style, style
+using SparseArraysBase: AbstractSparseArrayStyle, SparseArrayStyle, sparse_style, sparsezeros
+using Test: @test, @testset
+
+module TestSparseStyleUtils
+    using SparseArraysBase: AbstractSparseArray, AbstractSparseArrayStyle
+    using FunctionImplementations: FunctionImplementations
+    struct MySparseArrayStyle <: AbstractSparseArrayStyle end
+    struct MySparseArray{T, N} <: AbstractSparseArray{T, N}
+        size::NTuple{N, Int}
+    end
+    FunctionImplementations.Style(::Type{<:MySparseArray}) = MySparseArrayStyle()
+end
+
+@testset "Combine Sparse Styles" begin
+    @test sparse_style ≡ SparseArrayStyle()
+    @test Style(SparseArrayStyle(), SparseArrayStyle()) ≡ SparseArrayStyle()
+    @test Style(TestSparseStyleUtils.MySparseArrayStyle(), SparseArrayStyle()) ≡
+        SparseArrayStyle()
+    @test Style(SparseArrayStyle(), TestSparseStyleUtils.MySparseArrayStyle()) ≡
+        SparseArrayStyle()
+    @test style(TestSparseStyleUtils.MySparseArray{Float64, 2}((2, 2))) ≡
+        TestSparseStyleUtils.MySparseArrayStyle()
+    @test style(sparsezeros(2, 2), TestSparseStyleUtils.MySparseArray{Float64, 2}((2, 2))) ≡
+        SparseArrayStyle()
+end