diff --git a/src/services/decision-pack.ts b/src/services/decision-pack.ts
index 250f970e87..439ec1b469 100644
--- a/src/services/decision-pack.ts
+++ b/src/services/decision-pack.ts
@@ -616,7 +616,9 @@ function buildContributorDecisionPack(args: {
     ? new Map([...args.issueQualityByRepo.entries()].map(([repoFullName, report]) => [repoFullName.toLowerCase(), report]))
     : new Map<string, IssueQualityReport>();
   const languageSet = new Set((args.profile.github?.topLanguages ?? []).map((language) => language.toLowerCase()));
-  const labelHistory = new Set(args.profile.registeredRepoActivity?.dominantLabels ?? []);
+  // Case-insensitive, mirroring the opportunity engine (signals/engine.ts) and this file's own languageSet:
+  // GitHub labels compare case-insensitively, so a mixed-case dominant label must still overlap a config label.
+  const labelHistory = new Set((args.profile.registeredRepoActivity?.dominantLabels ?? []).map((label) => label.toLowerCase()));
   const roleContexts = registeredRepositories.map((repo) =>
     buildRoleContext({
       login: args.login,
@@ -773,7 +775,7 @@ function buildRepoDecision(args: {
   };
   const labelHistory = args.labelHistory;
   const labelFit = labelHistory
-    ? Object.keys(args.repo.registryConfig?.labelMultipliers ?? {}).filter((label) => labelHistory.has(label))
+    ? Object.keys(args.repo.registryConfig?.labelMultipliers ?? {}).filter((label) => labelHistory.has(label.toLowerCase()))
     : [];
   const copyContext: RepoCopyContext = {
     repoFullName: args.repo.fullName,
diff --git a/test/unit/decision-pack.test.ts b/test/unit/decision-pack.test.ts
index f57f212c03..9939d654e0 100644
--- a/test/unit/decision-pack.test.ts
+++ b/test/unit/decision-pack.test.ts
@@ -1379,6 +1379,43 @@ describe("decision-pack service", () => {
     ).not.toMatch(FORBIDDEN_PUBLIC_TRADEOFF_LANGUAGE);
   });
 
+  it("matches label history against config labels case-insensitively (regression)", () => {
+    // A mixed-case dominant label must overlap a differently-cased config label, mirroring the opportunity
+    // engine and this file's own case-insensitive languageSet. Covers both the built Set and the lookup.
+    const profile = {
+      login: "jsonbored",
+      github: { topLanguages: [] },
+      source: {},
+      gittensor: null,
+      registeredRepoActivity: { reposTouched: ["owner/gfi"], dominantLabels: ["Good First Issue"] },
+      trustSignals: {},
+    } as any;
+    const pack = __decisionPackInternals.buildContributorDecisionPack({
+      login: "jsonbored",
+      profile,
+      outcomeHistory: { login: "jsonbored", totals: {}, repoOutcomes: [], successPatterns: [], failurePatterns: [], summary: "" } as any,
+      repositories: [repoWithLabels("owner/gfi", 0.04, 0, { "good first issue": 1.5 })],
+      syncStates: [],
+      syncSegments: [],
+      totals: [],
+      scoringModelSnapshotId: "scoring-1",
+      contributorPullRequests: [],
+      contributorIssues: [],
+      openPrMonitor: emptyOpenPrMonitor("jsonbored"),
+    });
+    const decision = pack.repoDecisions.find((d) => d.repoFullName === "owner/gfi")!;
+    expect(decision.labelFit).toEqual(["good first issue"]);
+
+    // Direct lookup-side check: a mixed-case config key overlaps a lowercased history entry.
+    const repoDecision = __decisionPackInternals.buildRepoDecision({
+      repo: repoWithLabels("owner/lang", 0.005, 0, { "Good First Issue": 1.5 }),
+      roleContext: { maintainerLane: false } as any,
+      outcome: { openPullRequests: 0, mergedPullRequests: 1, closedPullRequestRate: 0, credibility: 1 } as any,
+      labelHistory: new Set(["good first issue"]),
+    } as any);
+    expect(repoDecision.labelFit).toEqual(["Good First Issue"]);
+  });
+
   it("covers languageMatch true/false and labelFit empty/non-empty paths", () => {
     const ctx = (overrides: Record<string, unknown> = {}) =>
       __decisionPackInternals.buildRepoDecision({