diff --git a/src/JuliaFEM.jl b/src/JuliaFEM.jl
index 15695f5..a8920eb 100644
--- a/src/JuliaFEM.jl
+++ b/src/JuliaFEM.jl
@@ -9,5 +9,6 @@ using Lexicon
 include("elasticity_solver.jl")
 include("xdmf.jl")
 include("abaqus_reader.jl")
+include("interfaces.jl")
 
 end # module