diff --git a/lix/libexpr/eval-cache.cc b/lix/libexpr/eval-cache.cc
index e4e5dabee..2fb950b77 100644
--- a/lix/libexpr/eval-cache.cc
+++ b/lix/libexpr/eval-cache.cc
@@ -352,7 +352,7 @@ Value * EvalCache::getRootValue(EvalState & state)
 
 ref<AttrCursor> EvalCache::getRoot()
 {
-    return make_ref<AttrCursor>(*this, std::nullopt);
+    return make_ref<AttrCursor>(ref<EvalCache>(*this), std::nullopt);
 }
 
 AttrCursor::AttrCursor(
diff --git a/lix/libstore/binary-cache-store.cc b/lix/libstore/binary-cache-store.cc
index 43872c7cb..f300a44ba 100644
--- a/lix/libstore/binary-cache-store.cc
+++ b/lix/libstore/binary-cache-store.cc
@@ -532,7 +532,7 @@ try {
 
 ref<FSAccessor> BinaryCacheStore::getFSAccessor()
 {
-    return make_ref<RemoteFSAccessor>(*this, config().localNarCache);
+    return make_ref<RemoteFSAccessor>(ref<Store>(*this), config().localNarCache);
 }
 
 kj::Promise<Result<void>>
diff --git a/lix/libstore/remote-store.cc b/lix/libstore/remote-store.cc
index e24c578b7..b3c74ab73 100644
--- a/lix/libstore/remote-store.cc
+++ b/lix/libstore/remote-store.cc
@@ -1022,7 +1022,7 @@ try {
 
 ref<FSAccessor> RemoteStore::getFSAccessor()
 {
-    return make_ref<RemoteFSAccessor>(*this);
+    return make_ref<RemoteFSAccessor>(ref<Store>(*this));
 }
 
 static Logger::Fields readFields(Source & from)
diff --git a/lix/libutil/ref.hh b/lix/libutil/ref.hh
index ab7e60e7b..44858e482 100644
--- a/lix/libutil/ref.hh
+++ b/lix/libutil/ref.hh
@@ -39,7 +39,7 @@ public:
     }
 
     template<std::derived_from<std::enable_shared_from_this<T>> T2>
-    ref(T2 & r) : p(r.shared_from_this())
+    explicit ref(T2 & r) : p(r.shared_from_this())
     {
     }