KS test and theoretical distribution

x <- runif(100)
y <- runif(100)
ks.test(x,y)

Two-sample Kolmogorov-Smirnov test

data:  x and y 
D = 0.11, p-value = 0.5806
alternative hypothesis: two-sided 

ok I expected that, but:

ks.test(runif(100), "runif")

One-sample Kolmogorov-Smirnov test

data:  runif(100) 
D = 0.9106, p-value < 2.2e-16
alternative hypothesis: two-sided 

How come? 

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