diff --git a/include/libcyphal/runnable.hpp b/include/libcyphal/runnable.hpp
index ca0d6cded..15281627f 100644
--- a/include/libcyphal/runnable.hpp
+++ b/include/libcyphal/runnable.hpp
@@ -14,7 +14,7 @@ namespace libcyphal
 class IRunnable
 {
 public:
-    virtual void run(TimePoint now) = 0;
+    virtual void run(const TimePoint now) = 0;
 
 protected:
     virtual ~IRunnable() = default;