diff --git a/runtime/permissions/mod.rs b/runtime/permissions/mod.rs
index cb1af76196..75d4af1c74 100644
--- a/runtime/permissions/mod.rs
+++ b/runtime/permissions/mod.rs
@@ -559,8 +559,14 @@ impl FromStr for NetDescriptor {
   type Err = AnyError;
 
   fn from_str(s: &str) -> Result<Self, Self::Err> {
-    let url = url::Url::parse(&format!("http://{s}"))?;
-    let hostname = url.host_str().unwrap().to_string();
+    // Set the scheme to `unknown` to parse the URL, as we really don't know
+    // what the scheme is. We only using Url::parse to parse the host and port
+    // and don't care about the scheme.
+    let url = url::Url::parse(&format!("unknown://{s}"))?;
+    let hostname = url
+      .host_str()
+      .ok_or(url::ParseError::EmptyHost)?
+      .to_string();
 
     Ok(NetDescriptor(hostname, url.port()))
   }
@@ -2273,7 +2279,9 @@ mod tests {
         "github.com:3000",
         "127.0.0.1",
         "172.16.0.2:8000",
-        "www.github.com:443"
+        "www.github.com:443",
+        "80.example.com:80",
+        "443.example.com:443"
       ]),
       ..Default::default()
     })
@@ -2297,6 +2305,9 @@ mod tests {
       ("172.16.0.2", 0, false),
       ("172.16.0.2", 6000, false),
       ("172.16.0.1", 8000, false),
+      ("443.example.com", 444, false),
+      ("80.example.com", 81, false),
+      ("80.example.com", 80, true),
       // Just some random hosts that should err
       ("somedomain", 0, false),
       ("192.168.0.1", 0, false),