diff --git a/core/embed/projects/prodtest/main.c b/core/embed/projects/prodtest/main.c
index ee2f862651..f927c687f6 100644
--- a/core/embed/projects/prodtest/main.c
+++ b/core/embed/projects/prodtest/main.c
@@ -246,7 +246,7 @@ static void test_display(const char *colors) {
   size_t w = DISPLAY_RESX / l;
 
   for (size_t i = 0; i < l; i++) {
-    uint16_t c = COLOR_BLACK;  // black
+    gfx_color_t c = COLOR_BLACK;  // black
     switch (colors[i]) {
       case 'R':
         c = gfx_color_rgb(255, 0, 0);