diff --git a/src/gallium/drivers/iris/iris_screen.c b/src/gallium/drivers/iris/iris_screen.c
index 010d5671a5b..a8e8c3884dd 100644
--- a/src/gallium/drivers/iris/iris_screen.c
+++ b/src/gallium/drivers/iris/iris_screen.c
@@ -285,6 +285,7 @@ iris_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
    case PIPE_CAP_FENCE_SIGNAL:
    case PIPE_CAP_IMAGE_STORE_FORMATTED:
    case PIPE_CAP_LEGACY_MATH_RULES:
+   case PIPE_CAP_ALPHA_TO_COVERAGE_DITHER_CONTROL:
       return true;
    case PIPE_CAP_UMA:
       return iris_bufmgr_vram_size(screen->bufmgr) == 0;
diff --git a/src/gallium/drivers/iris/iris_state.c b/src/gallium/drivers/iris/iris_state.c
index e8c73541326..15f1ed98fc6 100644
--- a/src/gallium/drivers/iris/iris_state.c
+++ b/src/gallium/drivers/iris/iris_state.c
@@ -1477,7 +1477,7 @@ iris_create_blend_state(struct pipe_context *ctx,
       bs.AlphaToCoverageEnable = state->alpha_to_coverage;
       bs.IndependentAlphaBlendEnable = indep_alpha_blend;
       bs.AlphaToOneEnable = state->alpha_to_one;
-      bs.AlphaToCoverageDitherEnable = state->alpha_to_coverage;
+      bs.AlphaToCoverageDitherEnable = state->alpha_to_coverage_dither;
       bs.ColorDitherEnable = state->dither;
       /* bl.AlphaTestEnable and bs.AlphaTestFunction are filled in later. */
    }