diff --git a/read-fonts/generated/generated_layout.rs b/read-fonts/generated/generated_layout.rs
index e48157a69..cbbc1b6a6 100644
--- a/read-fonts/generated/generated_layout.rs
+++ b/read-fonts/generated/generated_layout.rs
@@ -4399,7 +4399,7 @@ impl<'a> std::fmt::Debug for StylisticSetParams<'a> {
 }
 
 impl Format<u16> for CharacterVariantParamsMarker {
-    const FORMAT: u16 = 1;
+    const FORMAT: u16 = 0;
 }
 
 /// featureParams for ['cv01'-'cv99'](https://docs.microsoft.com/en-us/typography/opentype/spec/features_ae#cv01-cv99)
diff --git a/resources/codegen_inputs/layout.rs b/resources/codegen_inputs/layout.rs
index fe95f1483..e78ae0192 100644
--- a/resources/codegen_inputs/layout.rs
+++ b/resources/codegen_inputs/layout.rs
@@ -678,7 +678,7 @@ table StylisticSetParams {
 /// featureParams for ['cv01'-'cv99'](https://docs.microsoft.com/en-us/typography/opentype/spec/features_ae#cv01-cv99)
 table CharacterVariantParams {
     /// Format number is set to 0.
-    #[format = 1]
+    #[format = 0]
     format: u16,
     /// The 'name' table name ID that specifies a string (or strings,
     /// for multiple languages) for a user-interface label for this
diff --git a/write-fonts/generated/generated_layout.rs b/write-fonts/generated/generated_layout.rs
index cecbac191..fbef83119 100644
--- a/write-fonts/generated/generated_layout.rs
+++ b/write-fonts/generated/generated_layout.rs
@@ -2972,7 +2972,7 @@ impl CharacterVariantParams {
 impl FontWrite for CharacterVariantParams {
     #[allow(clippy::unnecessary_cast)]
     fn write_into(&self, writer: &mut TableWriter) {
-        (1 as u16).write_into(writer);
+        (0 as u16).write_into(writer);
         self.feat_ui_label_name_id.write_into(writer);
         self.feat_ui_tooltip_text_name_id.write_into(writer);
         self.sample_text_name_id.write_into(writer);