diff --git a/src/Reactor/Routine.hpp b/src/Reactor/Routine.hpp
index 14fa116..f9994ab 100644
--- a/src/Reactor/Routine.hpp
+++ b/src/Reactor/Routine.hpp
@@ -15,6 +15,16 @@
 #ifndef rr_Routine_hpp
 #define rr_Routine_hpp
 
+// A Clang extension to determine compiler features.
+// We use it to detect Sanitizer builds (e.g. -fsanitize=memory).
+#ifndef __has_feature
+#	define __has_feature(x) 0
+#endif
+
+#if __has_feature(memory_sanitizer)
+#	include "sanitizer/msan_interface.h"
+#endif
+
 #include <memory>
 
 namespace rr {
@@ -57,6 +67,11 @@
 	template<typename... Args>
 	Return operator()(Args... args) const
 	{
+#if __has_feature(memory_sanitizer)
+		// TODO(b/228253151): Fix support for detecting uninitialized parameters.
+		__msan_unpoison_param(sizeof...(args));
+#endif
+
 		return function(args...);
 	}