diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 6d5caf95..1c002c17 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -10,7 +10,7 @@ on:
 jobs:
   build:
     strategy:
-      fail-fast: false
+      fail-fast: true
       matrix:
         os:
           - macos-latest
@@ -36,7 +36,7 @@ jobs:
 
       - run: opam install . --deps-only --with-test
 
-      - run: opam exec -- dune build @install
+      - run: opam exec -- dune build @install -p tiny_httpd,tiny_httpd_camlzip,curly
 
-      - run: opam exec -- dune runtest
+      - run: opam exec -- dune build @src/runtest @examples/runtest
         if: ${{ matrix.os == 'ubuntu-latest' }}
diff --git a/tiny_httpd.opam b/tiny_httpd.opam
index 1e50a45c..631e5d79 100644
--- a/tiny_httpd.opam
+++ b/tiny_httpd.opam
@@ -12,6 +12,7 @@ build: [
 depends: [
   "dune" { >= "2.0" }
   "base-threads"
+  "result"
   "ocaml" { >= "4.04.0" }
   "odoc" {with-doc}
   "qtest" { >= "2.9" & with-test}