diff --git a/crates/tui/src/config.rs b/crates/tui/src/config.rs
index 96501b94..17b56992 100644
--- a/crates/tui/src/config.rs
+++ b/crates/tui/src/config.rs
@@ -2392,8 +2392,7 @@ fn apply_env_overrides(config: &mut Config) {
                 .providers
                 .get_or_insert_with(ProvidersConfig::default);
             let entry = match provider {
-                ApiProvider::Deepseek => &mut providers.deepseek,
-                ApiProvider::DeepseekCN => &mut providers.deepseek_cn,
+                ApiProvider::Deepseek | ApiProvider::DeepseekCN => unreachable!("DeepSeek providers are handled in the if branch above (issue #1714)"),
                 ApiProvider::NvidiaNim => &mut providers.nvidia_nim,
                 ApiProvider::Openai => &mut providers.openai,
                 ApiProvider::Atlascloud => &mut providers.atlascloud,