diff --git a/lib/layouts/acmart.layout b/lib/layouts/acmart.layout
index 9363a0dc8f..ae9b83399b 100644
--- a/lib/layouts/acmart.layout
+++ b/lib/layouts/acmart.layout
@@ -30,6 +30,7 @@ Provides ifxetex 1
 Provides inconsolata 1
 Provides latex-tools 1
 Provides libertine 1
+Provides makeidx 1
 Provides manyfoot 1
 Provides microtype 1
 Provides mmap 1