diff --git a/core/src/rendering/renderer.cpp b/core/src/rendering/renderer.cpp
index 07ddcb6..f5d73b2 100644
--- a/core/src/rendering/renderer.cpp
+++ b/core/src/rendering/renderer.cpp
@@ -476,7 +476,7 @@ void renderOutlines() {
 
     // Render AABB of selected parts
     PartAssembly selectionAssembly = PartAssembly::FromSelection();
-    if (!selectionAssembly.multipleSelected()) return;
+    if (selectionAssembly.size() == Vector3()) return;
     glm::vec3 outlineSize = selectionAssembly.bounds();
     glm::vec3 outlinePos = selectionAssembly.assemblyOrigin().Position();