diff --git a/src/sparsematrix.jl b/src/sparsematrix.jl
index 08d8a21a..2f8bd9ce 100644
--- a/src/sparsematrix.jl
+++ b/src/sparsematrix.jl
@@ -124,7 +124,7 @@ Get a writable copy of x. See `_unsafe_unfix(x)`
 """
 SparseMatrixCSC(x::FixedSparseCSC) = SparseMatrixCSC(size(x, 1), size(x, 2),
     copy(parent(getcolptr(x))),
-    copy(parent(rowval(x))),
+    copy(parent(rowvals(x))),
     copy(nonzeros(x)))
 
 function sparse_check_Ti(m::Integer, n::Integer, Ti::Type)
diff --git a/test/fixed.jl b/test/fixed.jl
index 1441929e..59c10346 100644
--- a/test/fixed.jl
+++ b/test/fixed.jl
@@ -20,6 +20,23 @@ using SparseArrays: AbstractSparseVector, AbstractSparseMatrixCSC, FixedSparseCS
     @test (r[1] = r[1]; true)
 end
 
+@testset "SparseMatrixCSC from readonly" begin
+
+    # test that SparseMatrixCSC from readonly does copy
+    A = sprandn(12, 11, 0.3)
+    B = SparseMatrixCSC(size(A)..., ReadOnly(getcolptr(A)), ReadOnly(rowvals(A)), nonzeros(A))
+
+    @test typeof(B) == typeof(A)
+    @test A == B
+
+    @test getcolptr(A) == getcolptr(B)
+    @test getcolptr(A) !== getcolptr(B)
+    @test rowvals(A) == rowvals(B)
+    @test rowvals(A) !== rowvals(B)
+    @test nonzeros(A) == nonzeros(B)
+    @test nonzeros(A) === nonzeros(B)
+end
+
 struct_eq(A, B, C...) = struct_eq(A, B) && struct_eq(B, C...)
 struct_eq(A::AbstractSparseMatrixCSC, B::AbstractSparseMatrixCSC) =
     getcolptr(A) == getcolptr(B) && rowvals(A) == rowvals(B)
@@ -30,6 +47,10 @@ struct_eq(A::AbstractSparseVector, B::AbstractSparseVector) =
     A = sprandn(10, 10, 0.3)
 
     F = FixedSparseCSC(copy(A))
+    Ft = FixedSparseCSC{eltype(A),eltype(rowvals(A))}(A)
+    @test typeof(Ft) == typeof(F)
+    @test Ft == F
+
     @test struct_eq(F, A)
     nonzeros(F) .= 0
     @test struct_eq(F, A)
@@ -69,7 +90,16 @@ struct_eq(A::AbstractSparseVector, B::AbstractSparseVector) =
     @test typeof(B) == typeof(F)
     @test struct_eq(B, F)
 end
+@testset "SparseMatrixCSC conversions" begin
+    A = sprandn(10, 10, 0.3)
+    F = fixed(copy(A))
+    B = SparseMatrixCSC(F)
+    @test A == B
 
+    # fixed(x...)
+    @test sparse(2I, 3, 3) == sparse(fixed(2I, 3, 3))
+    @test SparseArrays._unsafe_unfix(A) == A
+end
 @testset "FixedSparseVector" begin
     y = sprandn(10, 0.3)
     x = FixedSparseVector(copy(y))
@@ -88,7 +118,7 @@ end
     @test f(x, y, z) == 0
     t = similar(x)
     @test typeof(t) == typeof(x)
-    @test struct_eq(t, x)
+    @test struct_eq(t, x)    
 end
 
 @testset "Issue #190" begin
@@ -139,4 +169,4 @@ always_false(x...) = false
         @test all(iszero, nonzeros(b))
 
     end
-end
\ No newline at end of file
+end