diff --git a/src/lib/db.ts b/src/lib/db.ts
index a9c4ef0..0f8edc5 100644
--- a/src/lib/db.ts
+++ b/src/lib/db.ts
@@ -173,7 +173,6 @@ export const queries: Record<string, Statement> = {
       AND repo = @repo
       AND pr_number = @prNumber
       AND finding_fingerprint = @findingFingerprint
-      AND head_sha = @headSha
     LIMIT 1
   `),
 
diff --git a/src/services/__tests__/prFindingDismissals.test.ts b/src/services/__tests__/prFindingDismissals.test.ts
new file mode 100644
index 0000000..6f17d0c
--- /dev/null
+++ b/src/services/__tests__/prFindingDismissals.test.ts
@@ -0,0 +1,37 @@
+import { beforeEach, describe, expect, it } from "vitest";
+import {
+  clearPrFindingDismissals,
+  dismissPrFinding,
+  isPrFindingFingerprintDismissed,
+} from "../prFindingDismissals.js";
+
+describe("PR finding dismissals", () => {
+  const owner = "dismissal-owner";
+  const repo = "dismissal-repo";
+  const prNumber = 6191;
+
+  beforeEach(() => {
+    clearPrFindingDismissals(owner, repo, prNumber);
+  });
+
+  it("keeps a finding fingerprint dismissed across later PR heads", () => {
+    dismissPrFinding({
+      owner,
+      repo,
+      prNumber,
+      reviewCommentId: 3298017416,
+      findingFingerprint: "same-finding-fingerprint",
+      dismissedBy: "maintainer",
+      headSha: "old-head-sha",
+    });
+
+    expect(
+      isPrFindingFingerprintDismissed(
+        owner,
+        repo,
+        prNumber,
+        "same-finding-fingerprint",
+      ),
+    ).toBe(true);
+  });
+});
diff --git a/src/services/__tests__/prScan.test.ts b/src/services/__tests__/prScan.test.ts
index 9683f0b..6263652 100644
--- a/src/services/__tests__/prScan.test.ts
+++ b/src/services/__tests__/prScan.test.ts
@@ -160,7 +160,6 @@ Remove the lifecycle hook or replace it with reviewed local setup code.`),
       "repo",
       12,
       expect.any(String),
-      "abc123",
     );
   });
 
diff --git a/src/services/prFindingDismissals.ts b/src/services/prFindingDismissals.ts
index 92d68c3..5f8437d 100644
--- a/src/services/prFindingDismissals.ts
+++ b/src/services/prFindingDismissals.ts
@@ -34,14 +34,12 @@ export function isPrFindingFingerprintDismissed(
   repo: string,
   prNumber: number,
   findingFingerprint: string,
-  headSha: string,
 ): boolean {
   return !!queries.isPrFindingFingerprintDismissed.get({
     owner,
     repo,
     prNumber,
     findingFingerprint,
-    headSha,
   });
 }
 
diff --git a/src/services/prScan.ts b/src/services/prScan.ts
index 4e48a04..7182a4e 100644
--- a/src/services/prScan.ts
+++ b/src/services/prScan.ts
@@ -68,7 +68,7 @@ export async function runPrScan(
       await persistReviewedFindingDismissals(octokit, { owner, repo, prNumber, headSha });
       const findings = result.findings ?? [];
       const openFindings = findings.filter(
-        (finding) => !isFindingDismissed(owner, repo, prNumber, headSha, finding),
+        (finding) => !isFindingDismissed(owner, repo, prNumber, finding),
       );
 
       if (!openFindings.length) {
@@ -129,11 +129,10 @@ function isFindingDismissed(
   owner: string,
   repo: string,
   prNumber: number,
-  headSha: string,
   finding: PrFinding,
 ): boolean {
   const fingerprint = fingerprintPrFinding(finding);
-  return isPrFindingFingerprintDismissed(owner, repo, prNumber, fingerprint, headSha);
+  return isPrFindingFingerprintDismissed(owner, repo, prNumber, fingerprint);
 }
 
 function fingerprintPrFinding(finding: PrFinding): string {