diff --git a/crates/bevy_pbr/src/lightmap/mod.rs b/crates/bevy_pbr/src/lightmap/mod.rs
index 348ec49b69..80df8c73ae 100644
--- a/crates/bevy_pbr/src/lightmap/mod.rs
+++ b/crates/bevy_pbr/src/lightmap/mod.rs
@@ -116,9 +116,6 @@ pub struct Lightmap {
 /// There is one of these per visible lightmapped mesh instance.
 #[derive(Debug)]
 pub(crate) struct RenderLightmap {
-    /// The ID of the lightmap texture.
-    pub(crate) image: AssetId<Image>,
-
     /// The rectangle within the lightmap texture that the UVs are relative to.
     ///
     /// The top left coordinate is the `min` part of the rect, and the bottom
@@ -245,7 +242,6 @@ fn extract_lightmaps(
         render_lightmaps.render_lightmaps.insert(
             entity.into(),
             RenderLightmap::new(
-                lightmap.image.id(),
                 lightmap.uv_rect,
                 slab_index,
                 slot_index,
@@ -305,14 +301,12 @@ impl RenderLightmap {
     /// Creates a new lightmap from a texture, a UV rect, and a slab and slot
     /// index pair.
     fn new(
-        image: AssetId<Image>,
         uv_rect: Rect,
         slab_index: LightmapSlabIndex,
         slot_index: LightmapSlotIndex,
         bicubic_sampling: bool,
     ) -> Self {
         Self {
-            image,
             uv_rect,
             slab_index,
             slot_index,
diff --git a/crates/bevy_pbr/src/render/mesh.rs b/crates/bevy_pbr/src/render/mesh.rs
index 433df17c54..a66f9233fa 100644
--- a/crates/bevy_pbr/src/render/mesh.rs
+++ b/crates/bevy_pbr/src/render/mesh.rs
@@ -1905,7 +1905,7 @@ impl GetBatchData for MeshPipeline {
     type CompareData = (
         MaterialBindGroupIndex,
         AssetId<Mesh>,
-        Option<AssetId<Image>>,
+        Option<LightmapSlabIndex>,
     );
 
     type BufferData = MeshUniform;
@@ -1946,7 +1946,7 @@ impl GetBatchData for MeshPipeline {
             mesh_instance.should_batch().then_some((
                 material_bind_group_index.group,
                 mesh_instance.mesh_asset_id,
-                maybe_lightmap.map(|lightmap| lightmap.image),
+                maybe_lightmap.map(|lightmap| lightmap.slab_index),
             )),
         ))
     }
@@ -1976,7 +1976,7 @@ impl GetFullBatchData for MeshPipeline {
             mesh_instance.should_batch().then_some((
                 mesh_instance.material_bindings_index.group,
                 mesh_instance.mesh_asset_id,
-                maybe_lightmap.map(|lightmap| lightmap.image),
+                maybe_lightmap.map(|lightmap| lightmap.slab_index),
             )),
         ))
     }