diff --git a/src/axes.jl b/src/axes.jl
index f989a8fb..303e24db 100644
--- a/src/axes.jl
+++ b/src/axes.jl
@@ -365,7 +365,7 @@ function expand_extrema!(sp::Subplot, d::KW)
 
         bw = d[:bar_width]
         if bw == nothing
-            bw = d[:bar_width] = _bar_width * ignorenan_mean(diff(data))
+            bw = d[:bar_width] = _bar_width * ignorenan_minimum(filter(x->x>0,diff(data)))
         end
         axis = sp.attr[Symbol(dsym, :axis)]
         expand_extrema!(axis, ignorenan_maximum(data) + 0.5maximum(bw))
diff --git a/src/recipes.jl b/src/recipes.jl
index 876b3897..5f844967 100644
--- a/src/recipes.jl
+++ b/src/recipes.jl
@@ -289,7 +289,7 @@ end
     # compute half-width of bars
     bw = d[:bar_width]
     hw = if bw == nothing
-        0.5*_bar_width*ignorenan_mean(diff(procx))
+        0.5*_bar_width*ignorenan_minimum(filter(x->x>0, diff(procx)))
     else
         Float64[0.5_cycle(bw,i) for i=1:length(procx)]
     end