diff --git a/src/MDFInMemory.jl b/src/MDFInMemory.jl
index 63437df..9141a82 100644
--- a/src/MDFInMemory.jl
+++ b/src/MDFInMemory.jl
@@ -604,6 +604,7 @@ mutable struct MDFv2InMemory <: MPIFile # TODO: Not sure, if MPIFile is a good f
   end
 end
 
+MDFv2InMemory(mdfFile::MDFv2InMemory) = deepcopy(mdffile)
 MDFv2InMemory(mdfFile::MDFFileV2) = inMemoryMDFFromMDFFileV2(mdfFile)
 MDFv2InMemory(dict::Dict) = inMemoryMDFFromDict(dict)
 
diff --git a/test/MDFInMemory.jl b/test/MDFInMemory.jl
index 2776949..ccb9857 100644
--- a/test/MDFInMemory.jl
+++ b/test/MDFInMemory.jl
@@ -226,6 +226,13 @@ end
     @test rxUnit(mdf) == "V"
   end
 
+  @testset "Self-creation" begin
+    mdf = defaultMDFv2InMemory()
+    mdf_self = MDFv2InMemory(mdf)
+
+    @test typeof(mdf_self) == MDFv2InMemory
+  end
+
   @testset "Dict" begin
     @testset "String keys" begin
       dict = Dict{String, Any}()