diff --git a/client/src/components/Journey/JourneyMap.tsx b/client/src/components/Journey/JourneyMap.tsx
index 082c4a4f..88b08d0b 100644
--- a/client/src/components/Journey/JourneyMap.tsx
+++ b/client/src/components/Journey/JourneyMap.tsx
@@ -168,7 +168,8 @@ const JourneyMap = forwardRef<JourneyMapHandle, Props>(function JourneyMap(
     L.tileLayer(mapTileUrl || defaultTile, {
       maxZoom: 18,
       attribution: '&copy; <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a>',
-    }).addTo(map)
+      referrerPolicy: 'strict-origin-when-cross-origin',
+    } as any).addTo(map)
 
     const items = buildMarkerItems(entries)
     itemsRef.current = items
diff --git a/client/src/pages/AtlasPage.tsx b/client/src/pages/AtlasPage.tsx
index 0195da71..4dc4047e 100644
--- a/client/src/pages/AtlasPage.tsx
+++ b/client/src/pages/AtlasPage.tsx
@@ -296,8 +296,9 @@ export default function AtlasPage(): React.ReactElement {
       updateWhenIdle: false,
       tileSize: 256,
       zoomOffset: 0,
-      crossOrigin: true
-    }).addTo(map)
+      crossOrigin: true,
+      referrerPolicy: 'strict-origin-when-cross-origin',
+    } as any).addTo(map)
 
     // Preload adjacent zoom level tiles
     L.tileLayer(tileUrl, {
@@ -306,6 +307,7 @@ export default function AtlasPage(): React.ReactElement {
       opacity: 0,
       tileSize: 256,
       crossOrigin: true,
+      referrerPolicy: 'strict-origin-when-cross-origin',
     }).addTo(map)
 
     // Custom pane for region layer — above overlay (z-index 400)