diff --git a/libafl/src/observers/stdio.rs b/libafl/src/observers/stdio.rs
index 6f585b1abc..bcc893dddb 100644
--- a/libafl/src/observers/stdio.rs
+++ b/libafl/src/observers/stdio.rs
@@ -51,7 +51,7 @@ impl Named for StdOutObserver {
 
 /// An observer that captures stderr of a target.
 /// Only works for supported executors.
-#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+#[derive(Debug, Clone, PartialEq, Eq, Hash, Serialize, Deserialize)]
 pub struct StdErrObserver {
     /// The name of the observer.
     pub name: String,