diff --git a/frontend-modern/src/components/patrol/RunHistoryEntry.tsx b/frontend-modern/src/components/patrol/RunHistoryEntry.tsx
index 3b749030c..0fd46cfd2 100644
--- a/frontend-modern/src/components/patrol/RunHistoryEntry.tsx
+++ b/frontend-modern/src/components/patrol/RunHistoryEntry.tsx
@@ -273,7 +273,7 @@ export function RunHistoryEntry(props: RunHistoryEntryProps) {
                 ) : run.existing_findings > 0 ? (
                   <>
                     No new issues, but <strong>{run.existing_findings}</strong> existing issue
-                    {run.existing_findings !== 1 ? 's' : ''} remain.
+                    {run.existing_findings !== 1 ? 's remain' : ' remains'}.
                   </>
                 ) : !hasFindingsSnapshot ? (
                   <span class="text-blue-600 dark:text-blue-400">
diff --git a/frontend-modern/src/components/patrol/__tests__/RunHistoryEntry.test.tsx b/frontend-modern/src/components/patrol/__tests__/RunHistoryEntry.test.tsx
index 1a0ae381f..c281992cf 100644
--- a/frontend-modern/src/components/patrol/__tests__/RunHistoryEntry.test.tsx
+++ b/frontend-modern/src/components/patrol/__tests__/RunHistoryEntry.test.tsx
@@ -378,6 +378,41 @@ describe('RunHistoryEntry', () => {
     expect(screen.queryByText(/^All clear$/)).not.toBeInTheDocument();
   });
 
+  it('uses singular verb agreement when a single existing issue remains', () => {
+    render(() => (
+      <RunHistoryEntry
+        run={{
+          ...run,
+          id: 'run-existing-issue-singular',
+          existing_findings: 1,
+          status: 'issues_found',
+          findings_summary: 'One existing issue remains',
+        }}
+        isLive={false}
+        patrolStream={patrolStream}
+        selected={true}
+        onSelect={vi.fn()}
+      />
+    ));
+
+    expect(
+      screen.getByText(
+        (_, element) =>
+          element?.tagName === 'P' &&
+          (element.textContent?.includes('No new issues, but 1 existing issue remains.') ?? false),
+      ),
+    ).toBeInTheDocument();
+    // Guard against the regression: the prior wording was "1 existing issue remain."
+    expect(
+      screen.queryByText(
+        (_, element) =>
+          element?.tagName === 'P' &&
+          (element.textContent?.includes('existing issue remain.') ?? false) &&
+          !(element.textContent?.includes('remains.') ?? false),
+      ),
+    ).not.toBeInTheDocument();
+  });
+
   it('surfaces deterministic triage runs that skipped the llm', () => {
     render(() => (
       <RunHistoryEntry