diff --git a/scripts/unicode.py b/scripts/unicode.py
index cb3e2c7..c501a9f 100644
--- a/scripts/unicode.py
+++ b/scripts/unicode.py
@@ -297,7 +297,7 @@ def generate_script_impl(f):
     #[inline]
     pub(crate) fn inner_short_name(self) -> &'static str {
         match self {
-            Script::Unknown => "",
+            Script::Unknown => "Zzzz",
             Script::Common => "Zyyy",
             Script::Inherited => "Zinh",
 """)
@@ -312,6 +312,7 @@ def generate_script_impl(f):
     #[inline]
     pub(crate) fn inner_from_short_name(input: &str) -> Option<Self> {
         match input {
+            "Zzzz" => Some(Script::Unknown),
             "Zyyy" => Some(Script::Common),
             "Zinh" => Some(Script::Inherited),
 """)
diff --git a/src/tables.rs b/src/tables.rs
index d8c082b..28ee742 100644
--- a/src/tables.rs
+++ b/src/tables.rs
@@ -1598,7 +1598,7 @@ impl Script {
     #[inline]
     pub(crate) fn inner_short_name(self) -> &'static str {
         match self {
-            Script::Unknown => "",
+            Script::Unknown => "Zzzz",
             Script::Common => "Zyyy",
             Script::Inherited => "Zinh",
             Script::Adlam => "Adlm",
@@ -1775,6 +1775,7 @@ impl Script {
     #[inline]
     pub(crate) fn inner_from_short_name(input: &str) -> Option<Self> {
         match input {
+            "Zzzz" => Some(Script::Unknown),
             "Zyyy" => Some(Script::Common),
             "Zinh" => Some(Script::Inherited),
             "Adlm" => Some(Script::Adlam),