diff --git a/src/recipes.jl b/src/recipes.jl
index 45309c12..adf59872 100644
--- a/src/recipes.jl
+++ b/src/recipes.jl
@@ -132,7 +132,7 @@ end
 
 "Adds a+bx... straight line over the current plot"
 function abline!(plt::Plot, a, b; kw...)
-    plot!(plt, [xmin(plt), xmax(plt)], x -> b + a*x; kw...)
+    plot!(plt, [extrema(plt)...], x -> b + a*x; kw...)
 end
 
-abline!(args...; kw...) = abline!(current(), args...; kw...)
+abline!(args...; kw...) = abline!(current(), args...; kw...)
\ No newline at end of file
diff --git a/src/utils.jl b/src/utils.jl
index 576f4970..90431042 100644
--- a/src/utils.jl
+++ b/src/utils.jl
@@ -471,3 +471,5 @@ xmin(plt::Plot) = minimum([minimum(d[:x]) for d in plt.seriesargs])
 "Largest x in plot"
 xmax(plt::Plot) = maximum([maximum(d[:x]) for d in plt.seriesargs])
 
+"Extrema of x-values in plot"
+Base.extrema(plt::Plot) = (xmin(plt), xmax(plt))
\ No newline at end of file