diff --git a/src/gallium/drivers/zink/zink_program_state.hpp b/src/gallium/drivers/zink/zink_program_state.hpp
index 9badd47eb69..5bb73494aa2 100644
--- a/src/gallium/drivers/zink/zink_program_state.hpp
+++ b/src/gallium/drivers/zink/zink_program_state.hpp
@@ -128,7 +128,8 @@ zink_get_gfx_pipeline(struct zink_context *ctx,
    /* extra safety asserts for optimal path to catch refactoring bugs */
    if (prog->optimal_keys) {
       ASSERTED const union zink_shader_key_optimal *opt = (union zink_shader_key_optimal*)&prog->last_variant_hash;
-      ASSERTED union zink_shader_key_optimal sanitized{.val = zink_sanitize_optimal_key(ctx->gfx_stages, ctx->gfx_pipeline_state.shader_keys_optimal.key.val)};
+      ASSERTED union zink_shader_key_optimal sanitized = {};
+      sanitized.val = zink_sanitize_optimal_key(ctx->gfx_stages, ctx->gfx_pipeline_state.shader_keys_optimal.key.val);
       assert(opt->val == sanitized.val);
       assert(state->optimal_key == sanitized.val);
    }