diff --git a/include/libcamera/base/utils.h b/include/libcamera/base/utils.h
index 9ab18101..cfff0583 100644
--- a/include/libcamera/base/utils.h
+++ b/include/libcamera/base/utils.h
@@ -327,6 +327,12 @@ class Duration : public std::chrono::duration<double, std::nano>
 public:
 	Duration() = default;
 
+	template<typename Rep>
+	constexpr explicit Duration(const Rep &r)
+		: BaseDuration(r)
+	{
+	}
+
 	template<typename Rep, typename Period>
 	constexpr Duration(const std::chrono::duration<Rep, Period> &d)
 		: BaseDuration(d)
diff --git a/src/libcamera/base/utils.cpp b/src/libcamera/base/utils.cpp
index 8cf8a5b2..6a307940 100644
--- a/src/libcamera/base/utils.cpp
+++ b/src/libcamera/base/utils.cpp
@@ -406,6 +406,15 @@ std::string toAscii(const std::string &str)
  * duration in nanoseconds with double precision
  */
 
+/**
+ * \fn Duration::Duration(const Rep &r)
+ * \brief Construct a Duration with \a r ticks
+ * \param[in] r The number of ticks
+ *
+ * The constructed \a Duration object is internally represented in double
+ * precision with \a r nanoseconds ticks.
+ */
+
 /**
  * \fn Duration::Duration(const std::chrono::duration<Rep, Period> &d)
  * \brief Construct a Duration by converting an arbitrary std::chrono::duration