diff --git a/src/librustc/session/config.rs b/src/librustc/session/config.rs
index d4fa0f7d1f080..bbb32e58f12f5 100644
--- a/src/librustc/session/config.rs
+++ b/src/librustc/session/config.rs
@@ -2319,7 +2319,7 @@ mod tests {
         assert!(reference.dep_tracking_hash() != opts.dep_tracking_hash());
 
         opts = reference.clone();
-        opts.cg.panic = PanicStrategy::Abort;
+        opts.cg.panic = Some(PanicStrategy::Abort);
         assert!(reference.dep_tracking_hash() != opts.dep_tracking_hash());
     }