diff --git a/src/interface/linux.rs b/src/interface/linux.rs
index 134fdc4..bd9fae9 100644
--- a/src/interface/linux.rs
+++ b/src/interface/linux.rs
@@ -5,16 +5,20 @@ use crate::interface::InterfaceType;
 pub fn get_interface_type(if_name: String) -> InterfaceType {
     let if_type_path: String = format!("/sys/class/net/{}/type", if_name);
     let r = read_to_string(if_type_path);
-    let if_type_string = match r {
-        Ok(content) => content.trim().to_string(),
-        Err(_) => String::from("999"),
-    };
-    match if_type_string.parse::<u32>() {
-        Ok(if_type) => {
-            InterfaceType::try_from(if_type).unwrap_or(InterfaceType::Unknown)
+    match r {
+        Ok(content) => {
+            let if_type_string = content.trim().to_string();
+            match if_type_string.parse::<u32>() {
+                Ok(if_type) => {
+                    return InterfaceType::try_from(if_type).unwrap_or(InterfaceType::Unknown);
+                },
+                Err(_) => {
+                    return InterfaceType::Unknown;
+                }
+            }
         },
         Err(_) => {
-            InterfaceType::Unknown
+            return InterfaceType::Unknown;
         }
-    }
+    };   
 }
diff --git a/src/interface/types.rs b/src/interface/types.rs
index 2dd81f1..4437962 100644
--- a/src/interface/types.rs
+++ b/src/interface/types.rs
@@ -80,7 +80,7 @@ impl InterfaceType {
             InterfaceType::Atm => 19,
             InterfaceType::Wireless80211 => 801,
             InterfaceType::Tunnel => 768,
-            _ => 999,
+            _ => u32::MAX,
         }
     }