diff --git a/src/lib.rs b/src/lib.rs
index f340ec2..8a6c49c 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -345,7 +345,7 @@
         match value {
             Feature::FuncId(func_id) => (1 << 31) | func_id as u32,
             Feature::FeatureId(feature_id) => feature_id as u32,
-            Feature::Unknown(id) => panic!("Unknown feature or function ID {:#x?}", id),
+            Feature::Unknown(id) => id,
         }
     }
 }