diff --git a/src/lib.rs b/src/lib.rs
index b6830e5..ce1833c 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -245,7 +245,7 @@ pub async fn rate_limit_middleware<S: Sandboxing + Send + Sync + 'static>(
             )
             .nth_back(state.config.rate_limit.max_x_forwarded_for as usize - 1)
             .map(|addr| match addr {
-                IpAddr::V6(addr) => IpAddr::V6(addr & Ipv6Addr::from_bits(!0u128 << 64)),
+                IpAddr::V6(addr) => IpAddr::V6(addr & Ipv6Addr::from_bits(!0u128 >> 64)),
                 addr => addr,
             })
     } else {