diff --git a/rclcpp/include/rclcpp/rclcpp.hpp b/rclcpp/include/rclcpp/rclcpp.hpp
index 01c1c18..58892e3 100644
--- a/rclcpp/include/rclcpp/rclcpp.hpp
+++ b/rclcpp/include/rclcpp/rclcpp.hpp
@@ -27,39 +27,6 @@
 #include "rclcpp/utilities.hpp"
 #include "rclcpp/visibility_control.hpp"
 
-// NOLINTNEXTLINE(runtime/int)
-inline const std::chrono::seconds operator"" _s(unsigned long long s)
-{
-  return std::chrono::seconds(s);
-}
-inline const std::chrono::nanoseconds operator"" _s(long double s)
-{
-  return std::chrono::duration_cast<std::chrono::nanoseconds>(
-    std::chrono::duration<long double>(s));
-}
-
-// NOLINTNEXTLINE(runtime/int)
-inline const std::chrono::nanoseconds operator"" _ms(unsigned long long ms)
-{
-  return std::chrono::milliseconds(ms);
-}
-inline const std::chrono::nanoseconds operator"" _ms(long double ms)
-{
-  return std::chrono::duration_cast<std::chrono::nanoseconds>(
-    std::chrono::duration<long double, std::milli>(ms));
-}
-
-// NOLINTNEXTLINE(runtime/int)
-inline const std::chrono::nanoseconds operator"" _ns(unsigned long long ns)
-{
-  return std::chrono::nanoseconds(ns);
-}
-inline const std::chrono::nanoseconds operator"" _ns(long double ns)
-{
-  return std::chrono::duration_cast<std::chrono::nanoseconds>(
-    std::chrono::duration<long double, std::nano>(ns));
-}
-
 namespace rclcpp
 {