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Strange "not a symbol or valid symbol name" error


Greetings all, I'm using Mathematica 5.0 and have been getting a
strange error message:

Unique::usym :
10000000000 is not a symbol or a valid symbol name

This comes from the following integral:

Integrate[E^(-x) Sqrt[x^2-9], {x,3,5}]

The limits of integration don't matter much so long as they keep the
integrand real.

I don't understand this and am not quite sure how to fix the problem.
(It's a well defined definite integral, right? It's real in the domain
of integration and nondivergent.)

Thanks,
Flip


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