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We show that whenever the $q$-dimensional Minkowski content of a subset $A\subset {ℝ}^d$ exists and is finite and positive, then the “S-content” defined analogously as the Minkowski content, but with volume replaced by surface area, exists as well and equals the Minkowski content. As a corollary, we obtain the almost sure asymptotic behaviour of the surface area of the Wiener sausage in ${ℝ}^d$, $d\ge 3$.