diff --git a/tools/spec.py b/tools/spec.py
index 8f99e9d..51e8f58 100644
--- a/tools/spec.py
+++ b/tools/spec.py
@@ -882,8 +882,8 @@ if __name__ == '__main__':
 
         #pragma GCC diagnostic ignored "-Wunused-parameter"
 
-        static cruft::vk::icd::instance_table const *i_table = nullptr;
-        static cruft::vk::icd::device_table const *d_table = nullptr;
+        static cruft::vk::icd::instance_table const *i_table [[maybe_unused]] = nullptr;
+        static cruft::vk::icd::device_table const *d_table [[maybe_unused]] = nullptr;
 
         void (*cruft_vk_icdGetInstanceProcAddr) (
             VkInstance instance,