diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 8cc9fbc..009de5a 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -48,7 +48,7 @@ jobs:
       - run: opam exec -- dune runtest -p trace-tef,trace-fuchsia
 
       # with depopts
-      - run: opam install hmap unix
+      - run: opam install hmap
       - run: opam exec -- dune build '@install' -p trace,trace-tef,trace-fuchsia
 
       - run: opam install mtime