diff --git a/libs/vkd3d-shader/dxil.c b/libs/vkd3d-shader/dxil.c
index f8f0d2543..105a2e604 100644
--- a/libs/vkd3d-shader/dxil.c
+++ b/libs/vkd3d-shader/dxil.c
@@ -4104,6 +4104,7 @@ static enum vkd3d_shader_register_type register_type_from_dxil_semantic_kind(
         case VKD3D_SHADER_SV_SAMPLE_INDEX:
             return VKD3DSPR_NULL;
         case VKD3D_SHADER_SV_COVERAGE:
+            *dimension = is_input ? VSIR_DIMENSION_VEC4 : VSIR_DIMENSION_SCALAR;
             return is_input ? VKD3DSPR_COVERAGE : VKD3DSPR_SAMPLEMASK;
         case VKD3D_SHADER_SV_DEPTH:
             *dimension = VSIR_DIMENSION_SCALAR;
diff --git a/libs/vkd3d-shader/ir.c b/libs/vkd3d-shader/ir.c
index af7f00bfd..1eb0d891f 100644
--- a/libs/vkd3d-shader/ir.c
+++ b/libs/vkd3d-shader/ir.c
@@ -9553,6 +9553,7 @@ static void vsir_validate_register(struct validation_context *ctx,
         [VKD3DSPR_LOCALTHREADID]    = {true, 0, VSIR_DIMENSION_VEC4},
         [VKD3DSPR_LOCALTHREADINDEX] = {true, 0, VSIR_DIMENSION_VEC4},
         [VKD3DSPR_COVERAGE]         = {true, 0, VSIR_DIMENSION_VEC4},
+        [VKD3DSPR_SAMPLEMASK]       = {true, 0, VSIR_DIMENSION_SCALAR},
         [VKD3DSPR_DEPTHOUTGE]       = {true, 0, VSIR_DIMENSION_SCALAR},
         [VKD3DSPR_DEPTHOUTLE]       = {true, 0, VSIR_DIMENSION_SCALAR},
     };
@@ -9691,10 +9692,6 @@ static void vsir_validate_register(struct validation_context *ctx,
             vsir_validate_register_without_indices(ctx, reg);
             break;
 
-        case VKD3DSPR_SAMPLEMASK:
-            vsir_validate_register_without_indices(ctx, reg);
-            break;
-
         case VKD3DSPR_GSINSTID:
             vsir_validate_register_without_indices(ctx, reg);
             break;