diff --git a/test/rx.t.cpp b/test/rx.t.cpp
index 0984426a6..d51936de2 100644
--- a/test/rx.t.cpp
+++ b/test/rx.t.cpp
@@ -33,7 +33,7 @@ Context context;
 
 int main (int argc, char** argv)
 {
-  UnitTest ut (21);
+  UnitTest ut (23);
 
   std::string text = "This is a test.";