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Indoor positioning gained great interest in recent years. Several performance evaluations are available for consolidated systems, especially for ultra-wideband radios. Given the current success of mmWaves networks, in this paper, we investigate the performance of RSSI localization systems operating at mmWaves. Our reference is the IEEE 802.11ad standard for multi-Gbps WLANs. We tested the performance of RSSI localization in several scenarios differing in the number of access points serving as anchors and the RSSI acquisition. Our results show that RSSI localization is still effective at mmWaves using devices compliant with the IEEE 802.11ad standard in terms of sensitivity and frequency bands. We will show that these radios can achieve an accuracy of around 1 m if a sufficient number of measurement samples is acquired.