diff --git a/moment_kinetics/src/coordinates.jl b/moment_kinetics/src/coordinates.jl
index 1fa5c6ef4..057fec44f 100644
--- a/moment_kinetics/src/coordinates.jl
+++ b/moment_kinetics/src/coordinates.jl
@@ -6,7 +6,7 @@ export define_coordinate, write_coordinate
 export equally_spaced_grid
 export set_element_boundaries
 
-using InboundsArrays: get_noninbounds
+using InboundsArrays: get_noninbounds, AbstractInboundsArray
 using LinearAlgebra
 using ..type_definitions
 using ..array_allocation: allocate_float, allocate_shared_float, allocate_int, allocate_shared_int
@@ -26,12 +26,14 @@ using OrderedCollections: OrderedDict
 """
 structure containing basic information related to coordinates
 """
-struct coordinate{Tshared <: AbstractVector{mk_float}, Tsharedi <: AbstractVector{mk_int},
-                  Tunshared <: AbstractVector{mk_float},
-                  Tunsharedi <: AbstractVector{mk_int},
-                  Tunsharedmat <: AbstractMatrix{mk_float},
-                  Tunsharedmati <: AbstractMatrix{mk_int},
-                  Tunshared3 <: AbstractArray{mk_float,3}, Tbparams}
+struct coordinate{Tshared <: Union{AbstractVector{mk_float}, AbstractInboundsArray{mk_float, 1}},
+                  Tsharedi <: Union{AbstractVector{mk_int}, AbstractInboundsArray{mk_int, 1}},
+                  Tunshared <: Union{AbstractVector{mk_float}, AbstractInboundsArray{mk_float, 1}},
+                  Tunsharedi <: Union{AbstractVector{mk_int}, AbstractInboundsArray{mk_int, 1}},
+                  Tunsharedmat <: Union{AbstractMatrix{mk_float}, AbstractInboundsArray{mk_float, 2}},
+                  Tunsharedmati <: Union{AbstractMatrix{mk_int}, AbstractInboundsArray{mk_int, 2}},
+                  Tunshared3 <: Union{AbstractArray{mk_float,3}, AbstractInboundsArray{mk_float, 3}},
+                  Tbparams}
     # name is the name of the variable associated with this coordiante
     name::String
     # n_global is the total number of grid points associated with this coordinate