diff --git a/include/libcamera/base/utils.h b/include/libcamera/base/utils.h
index f21c6dc0..cb8caaa9 100644
--- a/include/libcamera/base/utils.h
+++ b/include/libcamera/base/utils.h
@@ -394,6 +394,11 @@ public:
 		return c.count();
 	}
 
+	constexpr Duration operator-() const
+	{
+		return BaseDuration::operator-();
+	}
+
 	explicit constexpr operator bool() const
 	{
 		return *this != BaseDuration::zero();
diff --git a/src/libcamera/base/utils.cpp b/src/libcamera/base/utils.cpp
index bcfc1941..cb9fe004 100644
--- a/src/libcamera/base/utils.cpp
+++ b/src/libcamera/base/utils.cpp
@@ -425,6 +425,12 @@ std::string toAscii(const std::string &str)
  * \return The tick count of the Duration expressed in \a Period
  */
 
+/**
+ * \fn Duration::operator-()
+ * \brief Negation operator to negate a \a Duration
+ * \return The duration, with the number of ticks negated
+ */
+
 /**
  * \fn Duration::operator bool()
  * \brief Boolean operator to test if a \a Duration holds a non-zero time value
diff --git a/test/utils.cpp b/test/utils.cpp
index d25475cb..195fddc9 100644
--- a/test/utils.cpp
+++ b/test/utils.cpp
@@ -167,6 +167,12 @@ protected:
 			return TestFail;
 		}
 
+		exposure = 100ms;
+		if ((-exposure).get<std::milli>() != -100) {
+			cerr << "utils::Duration failed negation" << endl;
+			return TestFail;
+		}
+
 		return TestPass;
 	}