diff --git a/libsigner/src/events.rs b/libsigner/src/events.rs
index a35e722d1..9af45ffca 100644
--- a/libsigner/src/events.rs
+++ b/libsigner/src/events.rs
@@ -225,6 +225,7 @@ impl SignerStopSignaler {
 }
 
 impl EventStopSignaler for SignerStopSignaler {
+    #[cfg_attr(test, mutants::skip)]
     fn send(&mut self) {
         self.stop_signal.store(true, Ordering::SeqCst);
         // wake up the thread so the atomicbool can be checked
diff --git a/libsigner/src/v0/messages.rs b/libsigner/src/v0/messages.rs
index 25336b798..af2226259 100644
--- a/libsigner/src/v0/messages.rs
+++ b/libsigner/src/v0/messages.rs
@@ -72,6 +72,7 @@ define_u8_enum!(SignerMessageTypePrefix {
     BlockResponse = 1
 });
 
+#[cfg_attr(test, mutants::skip)]
 impl MessageSlotID {
     /// Return the StackerDB contract corresponding to messages of this type
     pub fn stacker_db_contract(
diff --git a/libsigner/src/v1/messages.rs b/libsigner/src/v1/messages.rs
index e3c30f237..844d33785 100644
--- a/libsigner/src/v1/messages.rs
+++ b/libsigner/src/v1/messages.rs
@@ -108,6 +108,7 @@ define_u8_enum!(SignerMessageTypePrefix {
     EncryptedSignerState = 4
 });
 
+#[cfg_attr(test, mutants::skip)]
 impl MessageSlotID {
     /// Return the StackerDB contract corresponding to messages of this type
     pub fn stacker_db_contract(