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Let $(R,\frak m)$ be an excellent generalized Cohen-Macaulay local ring ofdimension $d$ that is $F$-injective on the punctured spectrum. Let $\frak q$ bea standard parameter ideal of $R$. The aim of the paper is to prove that$$\ell_R({\frak q}^F/{\frak q})\leq\sum\limits_{i=0}^{d}\binom{d}{i}\ell_R(0^F_{H^i_{\frak m}(R)}).$$ Moreover, if$\frak q$ is contained in a large enough power of $\frak m$, we have $${\frakq}^F/{\frak q} \cong \bigoplus_{i=0}^d (0^F_{H^i_{\frakm}(R)})^{\binom{d}{i}}.$$

On the Frobenius closure of parameter ideals when the ring is F-injective on the punctured spectrum