diff --git a/actions/duplicate.py b/actions/duplicate.py
index 9f9e75c..17036a6 100644
--- a/actions/duplicate.py
+++ b/actions/duplicate.py
@@ -13,9 +13,3 @@ class DuplicateAction(Action):
         """
         logger.debug("  - Duplicating given packet %s" % str(packet))
         return packet, packet.copy()
-
-    def mutate(self, environment_id=None):
-        """
-        Swaps its left and right child
-        """
-        self.left, self.right = self.right, self.left
diff --git a/actions/fragment.py b/actions/fragment.py
index e16a94e..d7f80c3 100644
--- a/actions/fragment.py
+++ b/actions/fragment.py
@@ -196,22 +196,3 @@ class FragmentAction(Action):
             self.correct_order = False
 
         return True
-
-    def mutate(self, environment_id=None):
-        """
-        Mutates the fragment action - it either chooses a new segment offset,
-        switches the packet order, and/or changes whether it segments or fragments.
-        """
-        self.correct_order = self.get_rand_order()
-        self.segment = random.choice([True, True, True, False])
-        if self.segment:
-            if random.random() < 0.5:
-                self.fragsize = int(random.uniform(1, 60))
-            else:
-                self.fragsize = -1
-        else:
-            if random.random() < 0.2:
-                self.fragsize = int(random.uniform(1, 50))
-            else:
-                self.fragsize = -1
-        return self
diff --git a/actions/layer.py b/actions/layer.py
index 36e8b59..3801837 100644
--- a/actions/layer.py
+++ b/actions/layer.py
@@ -780,8 +780,6 @@ class DNSLayer(Layer):
         if packet.haslayer("IP"):
             del packet["IP"].chksum
             del packet["IP"].len
-        if packet.haslayer("TCP"):
-            del packet["TCP"].chksum
         if packet.haslayer("UDP"):
             del packet["UDP"].chksum
             del packet["UDP"].len
diff --git a/tests/test_tamper.py b/tests/test_tamper.py
index 91c5809..817608c 100644
--- a/tests/test_tamper.py
+++ b/tests/test_tamper.py
@@ -139,7 +139,6 @@ def test_parse_parameters():
         actions.tamper.TamperAction().parse("not:enough", logger)
 
 
-
 def test_corrupt():
     """
     Tests the tamper 'corrupt' primitive.
@@ -240,6 +239,12 @@ def test_decompress():
     # Confirm tamper didn't corrupt anything else in the IP header
     assert confirm_unchanged(packet, original, IP, [])
 
+    packet = actions.packet.Packet(IP(dst="8.8.8.8")/TCP(dport=53)/DNS(qd=DNSQR(qname="maps.google.com")))
+    original = packet.copy()
+    tamper.tamper(packet, logger)
+    assert bytes(packet) == bytes(original)
+
+
 
 def test_corrupt_chksum():
     """