diff --git a/include/libcamera/internal/vector.h b/include/libcamera/internal/vector.h
index 4e9ef1ee6853..16b6aef0b38f 100644
--- a/include/libcamera/internal/vector.h
+++ b/include/libcamera/internal/vector.h
@@ -13,6 +13,7 @@
 #include <numeric>
 #include <optional>
 #include <ostream>
+#include <type_traits>
 
 #include <libcamera/base/log.h>
 #include <libcamera/base/span.h>
@@ -295,13 +296,13 @@ private:
 template<typename T>
 using RGB = Vector<T, 3>;
 
-template<typename T, unsigned int Rows, unsigned int Cols>
-Vector<T, Rows> operator*(const Matrix<T, Rows, Cols> &m, const Vector<T, Cols> &v)
+template<typename T, typename U, unsigned int Rows, unsigned int Cols>
+Vector<std::common_type_t<T, U>, Rows> operator*(const Matrix<T, Rows, Cols> &m, const Vector<U, Cols> &v)
 {
-	Vector<T, Rows> result;
+	Vector<std::common_type_t<T, U>, Rows> result;
 
 	for (unsigned int i = 0; i < Rows; i++) {
-		T sum = 0;
+		std::common_type_t<T, U> sum = 0;
 		for (unsigned int j = 0; j < Cols; j++)
 			sum += m[i][j] * v[j];
 		result[i] = sum;
diff --git a/src/libcamera/vector.cpp b/src/libcamera/vector.cpp
index 5567d5b8defb..4dad1b9001c5 100644
--- a/src/libcamera/vector.cpp
+++ b/src/libcamera/vector.cpp
@@ -308,9 +308,10 @@ LOG_DEFINE_CATEGORY(Vector)
  */
 
 /**
- * \fn Vector<T, Rows> operator*(const Matrix<T, Rows, Cols> &m, const Vector<T, Cols> &v)
+ * \fn operator*(const Matrix<T, Rows, Cols> &m, const Vector<U, Cols> &v)
  * \brief Multiply a matrix by a vector
- * \tparam T Numerical type of the contents of the matrix and vector
+ * \tparam T Numerical type of the contents of the matrix
+ * \tparam U Numerical type of the contents of the vector
  * \tparam Rows The number of rows in the matrix
  * \tparam Cols The number of columns in the matrix (= rows in the vector)
  * \param m The matrix