diff --git a/src/api/DashboardApi.ts b/src/api/DashboardApi.ts
index a8b3b0de..8e07ed9a 100644
--- a/src/api/DashboardApi.ts
+++ b/src/api/DashboardApi.ts
@@ -7,6 +7,7 @@ import {
   type RepoChanges,
   type LanguageWeight,
   type CommitLog,
+  type LinesTotal,
 } from './models/Dashboard';
 
 const useDashboardQuery = <TResponse = void, TSelect = TResponse>(
@@ -47,15 +48,10 @@ export const useRepoCommits = () =>
 // because the value is a SQL SUM it arrives as a string. Consumers unwrap and
 // coerce it (see useDashboardData).
 export const useLinesTotal = (params: { from: string; to: string }) =>
-  useDashboardQuery<{ linesCommitted: number | string }>(
-    'useLinesTotal',
-    '/lines/total',
-    undefined,
-    {
-      from: params.from,
-      to: params.to,
-    },
-  );
+  useDashboardQuery<LinesTotal>('useLinesTotal', '/lines/total', undefined, {
+    from: params.from,
+    to: params.to,
+  });
 
 export const useInfiniteCommitLog = (options?: {
   refetchInterval?: number;
diff --git a/src/api/models/Dashboard.ts b/src/api/models/Dashboard.ts
index 0e59a35b..337296e2 100644
--- a/src/api/models/Dashboard.ts
+++ b/src/api/models/Dashboard.ts
@@ -90,6 +90,14 @@ export type LanguageWeight = {
  *
  * API endpoint: GET /dash/stats
  */
+/**
+ * Cumulative lines committed for a date range.
+ * API endpoint: GET /dash/lines/total
+ */
+export type LinesTotal = {
+  linesCommitted: number;
+};
+
 export type Stats = {
   uniqueRepositories: string | number;
   totalLinesChanged: string | number;
diff --git a/src/pages/dashboard/useDashboardData.ts b/src/pages/dashboard/useDashboardData.ts
index 53cfdca1..d0283181 100644
--- a/src/pages/dashboard/useDashboardData.ts
+++ b/src/pages/dashboard/useDashboardData.ts
@@ -153,7 +153,7 @@ const useDashboardData = (range: TrendTimeRange) => {
     [datasets.prs.data],
   );
 
-  const totalLinesCommitted = Number(linesTotalQuery.data?.linesCommitted) || 0;
+  const totalLinesCommitted = linesTotalQuery.data?.linesCommitted ?? 0;
 
   const kpis = useMemo(
     () =>