diff --git a/rx/include/rx/SharedCV.hpp b/rx/include/rx/SharedCV.hpp
index 3c328933e..880956a96 100644
--- a/rx/include/rx/SharedCV.hpp
+++ b/rx/include/rx/SharedCV.hpp
@@ -46,6 +46,7 @@ protected:
 
 public:
   constexpr shared_cv() = default;
+  shared_cv(const shared_cv &) = delete;
 
   std::errc
   wait(std::unique_lock<shared_mutex> &lock,
diff --git a/rx/include/rx/SharedMutex.hpp b/rx/include/rx/SharedMutex.hpp
index 4b0d35b32..c6e1d9b88 100644
--- a/rx/include/rx/SharedMutex.hpp
+++ b/rx/include/rx/SharedMutex.hpp
@@ -27,6 +27,7 @@ class shared_mutex final {
 
 public:
   constexpr shared_mutex() = default;
+  shared_mutex(const shared_mutex &) = delete;
 
   bool try_lock_shared() {
     // Conditional increment