Barplot for degree distribution

In barplot for degree distribution x-axis is not seen.

See the example below

g = barabasi.game(500, 0.4)
dd1 = degree.distribution(g)
plot(dd1, xlab="degree", ylab = "frequency") 

whereas barplot doesnot have any x-axis

barplot(dd1, xlab = "degree", ylab = "frequency")

Please see the figures attached.
http://r.789695.n4.nabble.com/file/n3476831/barplot_dd__one_.png 
http://r.789695.n4.nabble.com/file/n3476831/plot_dd__one_.png 


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