diff --git a/src/executors/mod.rs b/src/executors/mod.rs
index b560b715cb..eba9fcd128 100644
--- a/src/executors/mod.rs
+++ b/src/executors/mod.rs
@@ -3,6 +3,7 @@ use crate::inputs::Input;
 use crate::observers::Observer;
 
 use std::ptr;
+use std::iter;
 
 pub enum ExitKind {
     Ok,
@@ -73,9 +74,7 @@ impl Executor for InMemoryExecutor {
     }
 
     fn post_exec_observers(&mut self) -> Result<(), AflError> {
-        for observer in &mut self.base.observers {
-            observer.post_exec(self)?;
-        }
+        self.base.observers.iter_mut().map(|x| x.post_exec());
         Ok(())
     }
 
diff --git a/src/observers/mod.rs b/src/observers/mod.rs
index 88db5fb53c..19fdd25667 100644
--- a/src/observers/mod.rs
+++ b/src/observers/mod.rs
@@ -9,7 +9,7 @@ pub trait Observer {
 
     fn reset(&mut self) -> Result<(), AflError>;
 
-    fn post_exec(&mut self, executor: &mut dyn Executor) -> Result<(), AflError> {
+    fn post_exec(&mut self) -> Result<(), AflError> {
         Ok(())
     }