diff --git a/Cargo.toml b/Cargo.toml
index 416c2f56e..b4fb8805d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 
 name = "url"
-version = "1.2.2"
+version = "1.2.3"
 authors = ["The rust-url developers"]
 
 description = "URL library for Rust, based on the WHATWG URL Standard"
diff --git a/src/host.rs b/src/host.rs
index 47b049a27..84da2c2fa 100644
--- a/src/host.rs
+++ b/src/host.rs
@@ -371,23 +371,33 @@ fn parse_ipv6addr(input: &str) -> ParseResult<Ipv6Addr> {
         }
         let mut dots_seen = 0;
         while i < len {
-            // FIXME: https://github.com/whatwg/url/commit/1c22aa119c354e0020117e02571cec53f7c01064
-            let mut value = 0u16;
+            let mut value = None;
             while i < len {
                 let digit = match input[i] {
                     c @ b'0' ... b'9' => c - b'0',
                     _ => break
                 };
-                value = value * 10 + digit as u16;
-                if value == 0 || value > 255 {
-                    return Err(ParseError::InvalidIpv6Address)
+                match value {
+                    None => value = Some(digit as u16),
+                    Some(0) => return Err(ParseError::InvalidIpv6Address),  // No leading zero
+                    Some(ref mut v) => {
+                        *v = *v * 10 + digit as u16;
+                        if *v > 255 {
+                            return Err(ParseError::InvalidIpv6Address)
+                        }
+                    }
                 }
+                i += 1;
             }
             if dots_seen < 3 && !(i < len && input[i] == b'.') {
                 return Err(ParseError::InvalidIpv6Address)
             }
-            pieces[piece_pointer] = pieces[piece_pointer] * 0x100 + value;
-            if dots_seen == 0 || dots_seen == 2 {
+            pieces[piece_pointer] = if let Some(v) = value {
+                pieces[piece_pointer] * 0x100 + v
+            } else {
+                return Err(ParseError::InvalidIpv6Address)
+            };
+            if dots_seen == 1 || dots_seen == 3 {
                 piece_pointer += 1;
             }
             i += 1;
diff --git a/src/lib.rs b/src/lib.rs
index f8be5e16b..513bd448b 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -314,7 +314,10 @@ impl Url {
             match self.host {
                 HostInternal::None => assert_eq!(host_str, ""),
                 HostInternal::Ipv4(address) => assert_eq!(host_str, address.to_string()),
-                HostInternal::Ipv6(address) => assert_eq!(host_str, format!("[{}]", address)),
+                HostInternal::Ipv6(address) => {
+                    let h: Host<String> = Host::Ipv6(address);
+                    assert_eq!(host_str, h.to_string())
+                }
                 HostInternal::Domain => {
                     if SchemeType::from(self.scheme()).is_special() {
                         assert!(!host_str.is_empty())
diff --git a/tests/urltestdata.json b/tests/urltestdata.json
index ee5416ecf..fca7d7b70 100644
--- a/tests/urltestdata.json
+++ b/tests/urltestdata.json
@@ -840,6 +840,36 @@
     "search": "",
     "hash": ""
   },
+  {
+    "input": "http://[::127.0.0.1]",
+    "base": "http://example.org/foo/bar",
+    "href": "http://[::7f00:1]/",
+    "origin": "http://[::7f00:1]",
+    "protocol": "http:",
+    "username": "",
+    "password": "",
+    "host": "[::7f00:1]",
+    "hostname": "[::7f00:1]",
+    "port": "",
+    "pathname": "/",
+    "search": "",
+    "hash": ""
+  },
+  {
+    "input": "http://[0:0:0:0:0:0:13.1.68.3]",
+    "base": "http://example.org/foo/bar",
+    "href": "http://[::d01:4403]/",
+    "origin": "http://[::d01:4403]",
+    "protocol": "http:",
+    "username": "",
+    "password": "",
+    "host": "[::d01:4403]",
+    "hostname": "[::d01:4403]",
+    "port": "",
+    "pathname": "/",
+    "search": "",
+    "hash": ""
+  },
   {
     "input": "http://[2001::1]:80",
     "base": "http://example.org/foo/bar",