diff --git a/src/TimeModeling/Modeling/misfit_fg.jl b/src/TimeModeling/Modeling/misfit_fg.jl
index ded4de639..0c1aa1e20 100644
--- a/src/TimeModeling/Modeling/misfit_fg.jl
+++ b/src/TimeModeling/Modeling/misfit_fg.jl
@@ -116,7 +116,7 @@ end
 
 # Type of accepted input
 Dtypes = Union{<:judiVector, NTuple{N, <:judiVector} where N, Vector{<:judiVector}}
-MTypes = Union{<:AbstractModel, NTuple{N, Model} where N, Vector{<:AbstractModel}}
+MTypes = Union{<:AbstractModel, NTuple{N, <:AbstractModel} where N, Vector{<:AbstractModel}}
 dmTypes = Union{dmType, NTuple{N, dmType} where N, Vector{dmType}}