diff --git a/src/process_messages.jl b/src/process_messages.jl
index a444651..504a19e 100644
--- a/src/process_messages.jl
+++ b/src/process_messages.jl
@@ -289,7 +289,7 @@ function handle_msg(msg::CallMsg{:call_fetch}, header, r_stream, w_stream, versi
             try
                 deliver_result(w_stream, :call_fetch, header.notify_oid, v.v)
             finally
-                unlock(v.rv.synctake)
+                unlock(v.rv.synctake::ReentrantLock)
             end
         else
             deliver_result(w_stream, :call_fetch, header.notify_oid, v)
diff --git a/src/remotecall.jl b/src/remotecall.jl
index 644ff04..d0ac719 100644
--- a/src/remotecall.jl
+++ b/src/remotecall.jl
@@ -706,8 +706,8 @@ function put_ref(rid, caller, args...)
     put!(rv, args...)
     if myid() == caller && rv.synctake !== nothing
         # Wait till a "taken" value is serialized out - github issue #29932
-        lock(rv.synctake)
-        unlock(rv.synctake)
+        lock(rv.synctake::ReentrantLock)
+        unlock(rv.synctake::ReentrantLock)
     end
     nothing
 end
@@ -731,7 +731,7 @@ function take_ref(rid, caller, args...)
         # special handling for local put! / remote take! on unbuffered channel
         # github issue #29932
         synctake = true
-        lock(rv.synctake)
+        lock(rv.synctake::ReentrantLock)
     end
 
     v = try
@@ -739,7 +739,7 @@ function take_ref(rid, caller, args...)
     catch e
         # avoid unmatched unlock when exception occurs
         # github issue #33972
-        synctake && unlock(rv.synctake)
+        synctake && unlock(rv.synctake::ReentrantLock)
         rethrow(e)
     end