diff --git a/CHANGELOG.md b/CHANGELOG.md
index aa6ef8c73..7078ae5c0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -37,6 +37,8 @@
     - Routing:
       - FIXED: Fix adding traffic signal penalties during compression [#6419](https://github.com/Project-OSRM/osrm-backend/pull/6419)
       - FIXED: Correctly handle compressed traffic signals. [#6724](https://github.com/Project-OSRM/osrm-backend/pull/6724)
+    - Debug tiles:
+      - FIXED: Ensure speed layer features have unique ids. [#6726](https://github.com/Project-OSRM/osrm-backend/pull/6726)
 # 5.27.1
   - Changes from 5.27.0
     - Misc:
diff --git a/src/engine/plugins/tile.cpp b/src/engine/plugins/tile.cpp
index 3ed573798..2a37824aa 100644
--- a/src/engine/plugins/tile.cpp
+++ b/src/engine/plugins/tile.cpp
@@ -508,7 +508,7 @@ void encodeVectorTile(const DataFacadeBase &facade,
                         auto tile_line = coordinatesToTileLine(a, b, tile_bbox);
                         if (!tile_line.empty())
                         {
-                            SpeedLayerFeatureBuilder fbuilder{speeds_layer, id};
+                            SpeedLayerFeatureBuilder fbuilder{speeds_layer, id++};
                             fbuilder.add_linestring_from_container(tile_line);
 
                             fbuilder.set_speed(speed_kmh_idx);
@@ -542,7 +542,7 @@ void encodeVectorTile(const DataFacadeBase &facade,
                         auto tile_line = coordinatesToTileLine(b, a, tile_bbox);
                         if (!tile_line.empty())
                         {
-                            SpeedLayerFeatureBuilder fbuilder{speeds_layer, id};
+                            SpeedLayerFeatureBuilder fbuilder{speeds_layer, id++};
                             fbuilder.add_linestring_from_container(tile_line);
 
                             fbuilder.set_speed(speed_kmh_idx);
diff --git a/test/nodejs/constants.js b/test/nodejs/constants.js
index 72b93da30..e56742e0c 100644
--- a/test/nodejs/constants.js
+++ b/test/nodejs/constants.js
@@ -10,7 +10,7 @@ exports.three_test_coordinates = [[7.41337, 43.72956],
 
 exports.two_test_coordinates = exports.three_test_coordinates.slice(0, 2)
 
-exports.test_tile = {'at': [17059, 11948, 15], 'size': 156539};
+exports.test_tile = {'at': [17059, 11948, 15], 'size': 159125};
 
 // Test files generated by the routing engine; check test/data
 if (process.env.OSRM_DATA_PATH !== undefined) {