diff --git a/Project.toml b/Project.toml
index f3efdf3..cc18e35 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,6 +1,6 @@
 name = "BlockBandedMatrices"
 uuid = "ffab5731-97b5-5995-9138-79e8c1846df0"
-version = "0.13.4"
+version = "0.13.5"
 
 [deps]
 ArrayLayouts = "4c555306-a7a7-4459-81d9-ec55ddd5c99a"
diff --git a/src/interfaceimpl.jl b/src/interfaceimpl.jl
index 8e5885f..b47650a 100644
--- a/src/interfaceimpl.jl
+++ b/src/interfaceimpl.jl
@@ -57,6 +57,13 @@ function blockbandwidths(::AbstractBandedLayout, (a,b)::Tuple{AbstractBlockedUni
     end
 end
 
+function blockbandwidths(::AbstractBandedLayout, (a,b)::Tuple{BlockedOneTo{<:Any,<:AbstractRange}, BlockedOneTo{<:Any,<:AbstractRange}}, A)
+    a ≠ b && return blockbandwidths(UnknownLayout(), (a,b), A) # can implement same step but not done yet
+    l,u = bandwidths(A)
+    s = step(a.lasts) # normal blocksize 
+    (l+s-1) ÷ s, (u+s-1) ÷ s
+end
+
 
 
 
diff --git a/test/test_misc.jl b/test/test_misc.jl
index fc6d29d..d670aad 100644
--- a/test/test_misc.jl
+++ b/test/test_misc.jl
@@ -195,6 +195,7 @@ Base.size(F::FiniteDifference) = (F.n,F.n)
         @test blockrowsupport(B,Block(1)) == Block.(1:2)
         @test blockrowsupport(B,Block(4)) == Block.(3:5)
 
+
         Q = Eye((a,))[:,Block(2)]
         @test Q isa BandedMatrix
         @test blockcolsupport(Q,Block(1)) == Block.(2:2)
@@ -210,6 +211,9 @@ Base.size(F::FiniteDifference) = (F.n,F.n)
 
             B = _BandedMatrix(randn(5,length(a)), a, 3, 1)
             @test blockbandwidths(B) == (4,0)
+
+            B = _BandedMatrix(BlockedArray(randn(5,length(a)),(Base.OneTo(5),a)), a, 3, 1)            
+            @test blockbandwidths(B) == (2,1)
         end
     end