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Let $G$ be a compact group, let $n\in N\setminus \{0,1\}$ be a fixed element and let $\sigma$ be a continuous automorphism on $G$ such that ${\sigma }^n=I$. Using the non-abelian Fourier transform, we determine the non-zero continuous solutions $f:G\to C$ of the functional equation $$f\left(xy\right)+\sum _{k=1}^{n-1}f\left({\sigma }^k\left(y\right)x\right)=nf\left(x\right)f\left(y\right),x,y\in G,$$ in terms of unitary characters of $G$.