diff --git a/3Dmesh/AFQ_AddImageTo3dPlot.m b/3Dmesh/AFQ_AddImageTo3dPlot.m
index c7aca0d..3a771c1 100644
--- a/3Dmesh/AFQ_AddImageTo3dPlot.m
+++ b/3Dmesh/AFQ_AddImageTo3dPlot.m
@@ -217,6 +217,7 @@
 % factors for the plane
 oldDim = size(image);
 newDim = oldDim .* scale(find(plane == 0))';
+newDim = abs(newDim); % dimensions can only be positive
 % Resize the image
 image = double(imresize(image,newDim));