diff --git a/src/include/ZividPython/Releasable.h b/src/include/ZividPython/Releasable.h
index a4da9cec..983522fc 100644
--- a/src/include/ZividPython/Releasable.h
+++ b/src/include/ZividPython/Releasable.h
@@ -1,5 +1,8 @@
 #pragma once
 
+#include <ZividPython/Traits.h>
+
+#include <cstddef>
 #include <memory>
 #include <optional>
 #include <pybind11/pybind11.h>
@@ -129,7 +132,8 @@ namespace ZividPython
     class Singleton
     {
     public:
-        template<typename... Args>
+        template<typename... Args,
+                 typename std::enable_if<!has_type<Singleton<T>, Args...>::value, void *>::type = nullptr>
         Singleton(Args &&...args)
         {
             // Keep the singleton alive forever to avoid races with
diff --git a/src/include/ZividPython/Traits.h b/src/include/ZividPython/Traits.h
index ac6d7a57..b5a6b442 100644
--- a/src/include/ZividPython/Traits.h
+++ b/src/include/ZividPython/Traits.h
@@ -1,6 +1,7 @@
 #pragma once
 
 #include <type_traits>
+#include <tuple>
 
 #if __has_include(<experimental/type_traits>)
 #    include <experimental/type_traits>
@@ -42,4 +43,17 @@ namespace ZividPython
     template<template<class...> class Op, class... Args>
     using is_detected = typename Detail::detector<Detail::nonesuch, void, Op, Args...>::value_t;
 #endif
+
+
+    template<typename T, typename... Ts>
+    struct has_type;
+
+    template<typename T, typename... Ts>
+    struct has_type<T, std::tuple<Ts...>> : std::disjunction<std::is_same<T, Ts>...>
+    {};
+
+    template<typename T, typename First, typename... Rest>
+    struct has_type<T, First, Rest...> : has_type<T, std::tuple<First, Rest...>>
+    {};
+
 } // namespace ZividPython
\ No newline at end of file