diff --git a/xtask/src/parity.rs b/xtask/src/parity.rs
index 0e906d28..54667761 100644
--- a/xtask/src/parity.rs
+++ b/xtask/src/parity.rs
@@ -251,6 +251,13 @@ mod tests {
         }
     }
 
+    #[test]
+    fn committed_manifest_is_well_formed() {
+        let path = root().join("parity/acrobat-features.toml");
+        let text = std::fs::read_to_string(&path).expect("read the committed parity manifest");
+        let _: File = toml::from_str(&text).expect("the committed parity manifest must be valid TOML");
+    }
+
     #[test]
     fn registry_ids_are_extracted_from_source() {
         let src =