diff --git a/libs/vkd3d-shader/ir.c b/libs/vkd3d-shader/ir.c
index f9662fb84..2ab5a8c69 100644
--- a/libs/vkd3d-shader/ir.c
+++ b/libs/vkd3d-shader/ir.c
@@ -9731,6 +9731,7 @@ static void vsir_validate_src_param(struct validation_context *ctx,
         [VKD3DSPSM_COMP]    = {F32_BIT},
         [VKD3DSPSM_X2]      = {F32_BIT},
         [VKD3DSPSM_X2NEG]   = {F32_BIT},
+        [VKD3DSPSM_DZ]      = {F32_BIT},
     };
     vsir_validate_register(ctx, &src->reg);