diff --git a/containers.opam b/containers.opam
index 0fc9832b..9f62d0c4 100644
--- a/containers.opam
+++ b/containers.opam
@@ -11,10 +11,6 @@ build-test: [ "jbuilder" "runtest" "-p" name "-j" jobs]
 depends: [
   "jbuilder" {build & >= "1.0+beta12"}
   "result"
-]
-depopts: [
-  "base-unix"
-  "base-threads"
   "qtest" { test }
   "qcheck" { test }
   "oUnit" { test }
@@ -22,6 +18,10 @@ depopts: [
   "gen" { test }
   "odoc" { doc }
 ]
+depopts: [
+  "base-unix"
+  "base-threads"
+]
 conflicts: [
   "sequence" { < "0.5" }
 ]