diff --git a/libafl/src/feedbacks/map.rs b/libafl/src/feedbacks/map.rs
index 45747204ae..7f78ab0589 100644
--- a/libafl/src/feedbacks/map.rs
+++ b/libafl/src/feedbacks/map.rs
@@ -23,7 +23,7 @@ use crate::{
     feedbacks::{Feedback, HasObserverName},
     inputs::UsesInput,
     monitors::UserStats,
-    observers::{MapObserver, ObserversTuple},
+    observers::{MapObserver, Observer, ObserversTuple, UsesObserver},
     state::{HasClientPerfMonitor, HasMetadata, HasNamedMetadata},
     Error,
 };
@@ -370,6 +370,14 @@ pub struct MapFeedback<N, O, R, S, T> {
     phantom: PhantomData<(N, O, R, S, T)>,
 }
 
+impl<N, O, R, S, T> UsesObserver<S> for MapFeedback<N, O, R, S, T>
+where
+    S: UsesInput,
+    O: Observer<S>,
+{
+    type Observer = O;
+}
+
 impl<N, O, R, S, T> Feedback<S> for MapFeedback<N, O, R, S, T>
 where
     N: IsNovel<T> + Debug,
diff --git a/libafl/src/observers/mod.rs b/libafl/src/observers/mod.rs
index 3fcd2036e1..743d2c3c8f 100644
--- a/libafl/src/observers/mod.rs
+++ b/libafl/src/observers/mod.rs
@@ -48,6 +48,15 @@ use crate::{
     Error,
 };
 
+/// Something that uses observer like mapfeedbacks
+pub trait UsesObserver<S>
+where
+    S: UsesInput,
+{
+    /// The observer type used
+    type Observer: Observer<S>;
+}
+
 /// Observers observe different information about the target.
 /// They can then be used by various sorts of feedback.
 pub trait Observer<S>: Named + Debug
diff --git a/libafl/src/stages/calibrate.rs b/libafl/src/stages/calibrate.rs
index 96102b3b54..6a7300f5ff 100644
--- a/libafl/src/stages/calibrate.rs
+++ b/libafl/src/stages/calibrate.rs
@@ -15,14 +15,11 @@ use crate::{
     corpus::{Corpus, CorpusId, SchedulerTestcaseMetaData},
     events::{Event, EventFirer, LogSeverity},
     executors::{Executor, ExitKind, HasObservers},
-    feedbacks::{
-        map::{IsNovel, MapFeedback, MapFeedbackMetadata, Reducer},
-        HasObserverName,
-    },
+    feedbacks::{map::MapFeedbackMetadata, HasObserverName},
     fuzzer::Evaluator,
     inputs::UsesInput,
     monitors::UserStats,
-    observers::{MapObserver, ObserversTuple},
+    observers::{MapObserver, ObserversTuple, UsesObserver},
     schedulers::powersched::SchedulerMetadata,
     stages::Stage,
     state::{HasClientPerfMonitor, HasCorpus, HasMetadata, HasNamedMetadata, UsesState},
@@ -321,13 +318,10 @@ where
 {
     /// Create a new [`CalibrationStage`].
     #[must_use]
-    pub fn new<N, R>(map_feedback: &MapFeedback<N, O, R, S, O::Entry>) -> Self
+    pub fn new<F>(map_feedback: &F) -> Self
     where
-        O::Entry:
-            PartialEq + Default + Copy + 'static + Serialize + serde::de::DeserializeOwned + Debug,
-        R: Reducer<O::Entry>,
+        F: HasObserverName + Named + UsesObserver<S, Observer = O>,
         for<'it> O: AsIter<'it, Item = O::Entry>,
-        N: IsNovel<O::Entry>,
     {
         Self {
             map_observer_name: map_feedback.observer_name().to_string(),
@@ -340,13 +334,10 @@ where
 
     /// Create a new [`CalibrationStage`], but without checking stability.
     #[must_use]
-    pub fn ignore_stability<N, R>(map_feedback: &MapFeedback<N, O, R, S, O::Entry>) -> Self
+    pub fn ignore_stability<F>(map_feedback: &F) -> Self
     where
-        O::Entry:
-            PartialEq + Default + Copy + 'static + Serialize + serde::de::DeserializeOwned + Debug,
-        R: Reducer<O::Entry>,
+        F: HasObserverName + Named + UsesObserver<S, Observer = O>,
         for<'it> O: AsIter<'it, Item = O::Entry>,
-        N: IsNovel<O::Entry>,
     {
         Self {
             map_observer_name: map_feedback.observer_name().to_string(),