diff --git a/crates/asn1-parser/tests/decode_encode.rs b/crates/asn1-parser/tests/decode_encode.rs
index 33971ad..a397def 100644
--- a/crates/asn1-parser/tests/decode_encode.rs
+++ b/crates/asn1-parser/tests/decode_encode.rs
@@ -293,3 +293,15 @@ fn test_1() {
     let asn1 = Asn1::decode_buff(raw).unwrap();
     println!("{:?}", asn1);
 }
+
+#[test]
+fn test_2() {
+    init_logging();
+
+    let raw = &[
+        4, 24, 16, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 30, 0, 0, 0,
+    ];
+
+    let asn1 = Asn1::decode_buff(raw).unwrap();
+    println!("{:?}", asn1);
+}
diff --git a/src/asn1/scheme/strings.rs b/src/asn1/scheme/strings.rs
index 8fa7250..31b21b5 100644
--- a/src/asn1/scheme/strings.rs
+++ b/src/asn1/scheme/strings.rs
@@ -39,7 +39,13 @@ pub fn octet_string(props: &OctetStringNodeProps) -> Html {
         },
         None => {
             let encoded_octets = match std::str::from_utf8(octets) {
-                Ok(s) => s.to_owned(),
+                Ok(s) => {
+                    if s.chars().any(|c| (c as u8) < 32) {
+                        hex::encode(octets)
+                    } else {
+                        s.to_owned()
+                    }
+                }
                 Err(_) => hex::encode(octets),
             };
             html! {