diff --git a/src/parts/epi_readouts.jl b/src/parts/epi_readouts.jl
index e74d20d3b4690c37fe8cc6062999160f5c922feb..f87de0b5cefaac48f8a9125e07f4601933602db6 100644
--- a/src/parts/epi_readouts.jl
+++ b/src/parts/epi_readouts.jl
@@ -61,7 +61,7 @@ function EPIReadout(; resolution::AbstractVector{<:Integer}, recenter=false, gro
     return res
 end
 
-@defvar begin
+@defvar readout begin
     inverse_fov(epi::EPIReadout) = [variables.inverse_fov(epi.positive_line), 1e3 * epi.ky_step]
     inverse_voxel_size(epi::EPIReadout) = [variables.inverse_voxel_size(epi.positive_line), 1e3 * epi.ky_step * maximum(abs.(epi.ky_lines))]
     resolution(epi::EPIReadout) = [variables.resolution(epi.positive_line), maximum(abs.(epi.ky_lines))]