diff --git a/src/openrct2-ui/windows/Ride.cpp b/src/openrct2-ui/windows/Ride.cpp
index 1e8252309b..4411c34769 100644
--- a/src/openrct2-ui/windows/Ride.cpp
+++ b/src/openrct2-ui/windows/Ride.cpp
@@ -4203,19 +4203,19 @@ static_assert(std::size(RatingNames) == 6);
                     uint16_t i, colour;
                     for (i = 0; i < numItems; i++)
                     {
-                        colour = UtilRand() & COLOUR_NUM_NORMAL;
+                        colour = UtilRand() % COLOUR_NUM_NORMAL;
                         auto vehicleSetBodyColourAction = RideSetAppearanceAction(
                             rideId, RideSetAppearanceType::VehicleColourBody, colour, i);
                         GameActions::Execute(&vehicleSetBodyColourAction);
                         if (allowChangingTrimColour)
                         {
-                            colour = UtilRand() & COLOUR_NUM_NORMAL;
+                            colour = UtilRand() % COLOUR_NUM_NORMAL;
                             auto vehicleSetTrimColourAction = RideSetAppearanceAction(
                                 rideId, RideSetAppearanceType::VehicleColourTrim, colour, i);
                             GameActions::Execute(&vehicleSetTrimColourAction);
                             if (allowChangingTertiaryColour)
                             {
-                                colour = UtilRand() & COLOUR_NUM_NORMAL;
+                                colour = UtilRand() % COLOUR_NUM_NORMAL;
                                 auto vehicleSetTertiaryColourAction = RideSetAppearanceAction(
                                     rideId, RideSetAppearanceType::VehicleColourTertiary, colour, i);
                                 GameActions::Execute(&vehicleSetTertiaryColourAction);