diff --git a/src/concepts/pattern/ip/mod.rs b/src/concepts/pattern/ip/mod.rs
index 2fdfd80..3bf727c 100644
--- a/src/concepts/pattern/ip/mod.rs
+++ b/src/concepts/pattern/ip/mod.rs
@@ -45,7 +45,7 @@ impl PatternType {
             // then 1xx
             "1[0-9][0-9]",
             // then 0xx
-            "[0-9][0-9]",
+            "[1-9][0-9]",
             // then 0x
             "[0-9])",
         ]
@@ -641,6 +641,7 @@ mod patternip_tests {
             assert2!(!regex.is_match("1.2.3.4 "));
             assert2!(!regex.is_match("1.2. 3.4"));
             assert2!(!regex.is_match("257.2.3.4"));
+            assert2!(!regex.is_match("074.2.3.4"));
             assert2!(!regex.is_match("1.2.3.4.5"));
             assert2!(!regex.is_match("1.2..4"));
             assert2!(!regex.is_match("1.2..3.4"));
diff --git a/src/concepts/pattern/ip/utils.rs b/src/concepts/pattern/ip/utils.rs
index a294c55..2e1ad66 100644
--- a/src/concepts/pattern/ip/utils.rs
+++ b/src/concepts/pattern/ip/utils.rs
@@ -79,6 +79,8 @@ mod utils_tests {
             normalize("::ffff:1.2.3.4"),
             Ok(IpAddr::V4(Ipv4Addr::new(1, 2, 3, 4)))
         );
+        // octal numbers are forbidden
+        assert!(normalize("083.44.23.14").is_err());
     }
 
     #[test]