diff --git a/src/parts/epi_readouts.jl b/src/parts/epi_readouts.jl
index ed59ff23a5365307bee95ecc31dd2452fec5cf50..8d775e7c874c127f21e4d95a61a784741b919957 100644
--- a/src/parts/epi_readouts.jl
+++ b/src/parts/epi_readouts.jl
@@ -63,7 +63,7 @@ end
 
 @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))]
+    inverse_voxel_size(epi::EPIReadout) = [variables.inverse_voxel_size(epi.positive_line)[1], 1e3 * epi.ky_step * maximum(abs.(epi.ky_lines))]
     resolution(epi::EPIReadout) = [variables.resolution(epi.positive_line), maximum(abs.(epi.ky_lines))]
 end
 get_readout(epi::EPIReadout) = epi.positive_line