diff --git a/imgui/imconfig.h b/imgui/imconfig.h
index e557fa06..894f24e4 100755
--- a/imgui/imconfig.h
+++ b/imgui/imconfig.h
@@ -45,7 +45,7 @@
 */
 
 //---- Use 32-bit vertex indices (instead of default: 16-bit) to allow meshes with more than 64K vertices
-//#define ImDrawIdx unsigned int
+#define ImDrawIdx unsigned int
 
 //---- Tip: You can add extra functions within the ImGui:: namespace, here or in your own headers files.
 //---- e.g. create variants of the ImGui::Value() helper for your low-level math types, or your own widgets/helpers.