diff --git a/scene/resources/immediate_mesh.h b/scene/resources/immediate_mesh.h
index bf07c82a0c78..8ff0ff3e6a59 100644
--- a/scene/resources/immediate_mesh.h
+++ b/scene/resources/immediate_mesh.h
@@ -63,7 +63,7 @@ class ImmediateMesh : public Mesh {
 		Ref<Material> material;
 		bool vertex_2d = false;
 		int array_len = 0;
-		uint32_t format = 0;
+		uint64_t format = 0;
 		AABB aabb;
 	};
 
diff --git a/scene/resources/mesh.h b/scene/resources/mesh.h
index fd54b47b705e..5233d750097b 100644
--- a/scene/resources/mesh.h
+++ b/scene/resources/mesh.h
@@ -301,7 +301,7 @@ class ArrayMesh : public Mesh {
 
 private:
 	struct Surface {
-		uint32_t format = 0;
+		uint64_t format = 0;
 		int array_length = 0;
 		int index_array_length = 0;
 		PrimitiveType primitive = PrimitiveType::PRIMITIVE_MAX;