diff --git a/src/gallium/drivers/iris/iris_clear.c b/src/gallium/drivers/iris/iris_clear.c
index cf0699726fd..4171a876c76 100644
--- a/src/gallium/drivers/iris/iris_clear.c
+++ b/src/gallium/drivers/iris/iris_clear.c
@@ -163,6 +163,7 @@ convert_fast_clear_color(struct iris_context *ice,
       for (int i = 0; i < 4; i++) {
          unsigned bits = util_format_get_component_bits(
             format, UTIL_FORMAT_COLORSPACE_RGB, i);
+         assert(bits > 0);
          if (bits < 32) {
             int32_t max = (1 << (bits - 1)) - 1;
             int32_t min = -(1 << (bits - 1));