diff --git a/server-rs/crates/platform-tripo/src/common/validation.rs b/server-rs/crates/platform-tripo/src/common/validation.rs
index 3ce263d22..3bb6dd878 100644
--- a/server-rs/crates/platform-tripo/src/common/validation.rs
+++ b/server-rs/crates/platform-tripo/src/common/validation.rs
@@ -68,7 +68,7 @@ pub(crate) fn validate_generation_options(
         ));
     }
 
-    if options.auto_size.is_some() && matches!(family, ModelFamily::H25) {
+    if options.auto_size == Some(true) && matches!(family, ModelFamily::H25) {
         return Err(invalid(
             Some(TripoField::AutoSize),
             TripoValidationReason::InvalidCombination,