diff --git a/Cargo.toml b/Cargo.toml
index 685e9b6..2d44636 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -15,6 +15,7 @@ futures = "0.3"
 futures-util = "0.3"
 hex = "0.4"
 hyper = "0.14"
+itertools = "0.10"
 openssl = "0.10"
 percent-encoding = "2"
 serde = { version = "1.0", features = ["derive"] }
diff --git a/src/main.rs b/src/main.rs
index cefe565..ea5693c 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -159,6 +159,7 @@ impl CtrlTunnel {
                         return true;
                     }
 
+                    use itertools::Itertools;
                     let fp = match cert.digest(openssl::hash::MessageDigest::sha256()) {
                         Ok(fp) => fp,
                         Err(err) => {
@@ -171,8 +172,7 @@ impl CtrlTunnel {
                     let fp_string = fp_string
                         .as_bytes()
                         .chunks(2)
-                        .map(|v| std::str::from_utf8(v).unwrap())
-                        .collect::<Vec<&str>>()
+                        .map(|v| unsafe { std::str::from_utf8_unchecked(v) })
                         .join(":");
 
                     let expected = expected.to_lowercase();