diff --git a/backend/genesys/image_pixel.cpp b/backend/genesys/image_pixel.cpp
index 1b83e127d..1ebba7fe0 100644
--- a/backend/genesys/image_pixel.cpp
+++ b/backend/genesys/image_pixel.cpp
@@ -46,6 +46,7 @@
 #include "image.h"
 
 #include <array>
+#include <cmath>
 
 namespace genesys {
 
@@ -207,7 +208,7 @@ void set_pixel_to_row(std::uint8_t* data, std::size_t x, Pixel pixel, PixelForma
             float val = (pixel.r >> 8) * 0.3f;
             val += (pixel.g >> 8) * 0.59f;
             val += (pixel.b >> 8) * 0.11f;
-            data[x] = static_cast<std::uint16_t>(val);
+            data[x] = static_cast<std::uint16_t>(roundf(val));
             return;
         }
         case PixelFormat::I16: {
@@ -215,7 +216,7 @@ void set_pixel_to_row(std::uint8_t* data, std::size_t x, Pixel pixel, PixelForma
             float val = pixel.r * 0.3f;
             val += pixel.g * 0.59f;
             val += pixel.b * 0.11f;
-            auto val16 = static_cast<std::uint16_t>(val);
+            auto val16 = static_cast<std::uint16_t>(roundf(val));
             data[x] = val16 & 0xff;
             data[x + 1] = (val16 >> 8) & 0xff;
             return;