diff --git a/src/util/format/u_format.c b/src/util/format/u_format.c
index c071250d874..b8100fcd985 100644
--- a/src/util/format/u_format.c
+++ b/src/util/format/u_format.c
@@ -1354,7 +1354,7 @@ util_format_rgbx_to_rgba(enum pipe_format format)
    case PIPE_FORMAT_B10G10R10X2_SINT:
       return PIPE_FORMAT_B10G10R10A2_SINT;
    default: {
-      const struct util_format_description *desc = util_format_description(format);
+      ASSERTED const struct util_format_description *desc = util_format_description(format);
 
       /* Assert that the format doesn't contain X instead of A. */
       assert(desc->colorspace != UTIL_FORMAT_COLORSPACE_ZS ||