diff --git a/src/interface.jl b/src/interface.jl
index 299ff42..bbc541b 100644
--- a/src/interface.jl
+++ b/src/interface.jl
@@ -29,13 +29,13 @@ A.objective(m::MATFBCModel) =
 looks_like_squashed_coupling(mat) =
     haskey(mat, "A") && haskey(mat, "b") && length(mat["b"]) == size(mat["A"], 1)
 
-A.n_couplings(m::MATModel) =
+A.n_couplings(m::MATFBCModel) =
     looks_like_squashed_coupling(m.mat) ? size(m.mat["A"], 1) - n_reactions(m) :
     size(get(m.mat, "C", zeros(0, n_reactions(m))), 1)
 
-A.couplings(m::MATModel) = String["mat_coupling_$i" for i = 1:n_couplings(m)]
+A.couplings(m::MATFBCModel) = String["mat_coupling_$i" for i = 1:n_couplings(m)]
 
-A.coupling(m::MATModel) =
+A.coupling(m::MATFBCModel) =
     looks_like_squashed_coupling(m.mat) ? sparse(m.mat["A"][n_reactions(m)+1:end, :]) :
     sparse(get(m.mat, "C", zeros(0, n_reactions(m))))
 
@@ -45,7 +45,7 @@ $(TYPEDSIGNATURES)
 Overload of `coupling_weights` for `MATFBCModel` is currently quite
 inefficient. Use `coupling` instead.
 """
-function A.coupling_weights(m::MATModel, cid::String)
+function A.coupling_weights(m::MATFBCModel, cid::String)
     startswith(cid, "mat_coupling_") || throw(DomainError(cid, "unknown coupling"))
     cidx = parse(Int, cid[14:end])
     return Dict(r => w for (r, w) in zip(A.reactions(m), A.coupling(m)[cidx, :]) if w != 0)