diff --git a/libs/vkd3d-shader/ir.c b/libs/vkd3d-shader/ir.c
index 3b53fccc..98f52f10 100644
--- a/libs/vkd3d-shader/ir.c
+++ b/libs/vkd3d-shader/ir.c
@@ -8186,6 +8186,10 @@ static void vsir_validate_src_param(struct validation_context *ctx,
                     "Invalid NULL register used as source parameter.");
             break;
 
+        case VKD3DSPR_INPUT:
+            vsir_validate_io_src_param(ctx, src);
+            break;
+
         case VKD3DSPR_OUTPUT:
             vsir_validate_io_src_param(ctx, src);
             break;