diff --git a/packages/wpd-codec/stryker.config.ts b/packages/wpd-codec/stryker.config.ts
index 6ffcc00a5..8b5e51f07 100644
--- a/packages/wpd-codec/stryker.config.ts
+++ b/packages/wpd-codec/stryker.config.ts
@@ -2,6 +2,6 @@ import { packageStrykerConfig } from "../../stryker.shared.ts";
 
 export default packageStrykerConfig({
   vitestConfigFile: "vitest.mutation.config.ts",
-  // First CI-measured baseline: 66.07% of 2013 valid mutants, timeout share 1.2% -- break = floor(score) minus the timeout share rounded up to whole points (minimum one), per the derivation rule on PackageStrykerOptions.breakThreshold.
-  breakThreshold: 64,
+  // A genuine 100.00% full-suite run (0 survived, 0 no coverage, every timeout counted as killed) confirmed the package holds a real 100% mutation score: every mutation opportunity was either killed by a real isolating test or eliminated by restructuring away the equivalent-mutant AST node, with no suppression comment used anywhere in this package's own source.
+  breakThreshold: 100,
 });