diff --git a/src/recipes.jl b/src/recipes.jl
index b69ed3f3..ed6f2331 100644
--- a/src/recipes.jl
+++ b/src/recipes.jl
@@ -398,7 +398,7 @@ end
     bw = plotattributes[:bar_width]
     hw = if bw === nothing
         if nx > 1
-            0.5 * _bar_width * ignorenan_minimum(filter(x -> x > 0, diff(procx)))
+            0.5 * _bar_width * ignorenan_minimum(filter(x -> x > 0, diff(sort(procx))))
         else
             0.5 * _bar_width
         end