diff --git a/src/mutable_list.jl b/src/mutable_list.jl
index cf085d59..31840fc2 100644
--- a/src/mutable_list.jl
+++ b/src/mutable_list.jl
@@ -152,9 +152,9 @@ end
 
 function Base.append!(l1::MutableLinkedList{T}, l2::MutableLinkedList{T}) where T
     l1.node.prev.next = l2.node.next # l1's last's next is now l2's first
-    l2.node.prev.next = l1.node # l2's last's next is now l1.node
     l2.node.next.prev = l1.node.prev # l2's first's prev is now l1's last
-    l1.node.prev      = l2.node.prev # l1's first's prev is now l2's last
+    l1.node.prev      = l2.node.prev # l1's last is now l2's last
+    l2.node.prev.next = l1.node # l2's last's next is now l1.node
     l1.len += length(l2)
     # make l2 empty
     l2.node.prev = l2.node
diff --git a/test/test_mutable_list.jl b/test/test_mutable_list.jl
index d3bf7491..819f5215 100644
--- a/test/test_mutable_list.jl
+++ b/test/test_mutable_list.jl
@@ -108,6 +108,10 @@
                     push!(l4, n+1:2n...)
                     @test l4 == MutableLinkedList{Int}(1:2n...)
                     @test collect(l4) == collect(MutableLinkedList{Int}(1:2n...))
+                    l5 = MutableLinkedList{Int}(1:n...)
+                    l6 = MutableLinkedList{Int}()
+                    append!(l5, l6)
+                    @test l5.node.prev !== l5.node.prev.next
                 end
 
                 @testset "delete" begin