diff --git a/tardis/montecarlo/montecarlo_transport_state.py b/tardis/montecarlo/montecarlo_transport_state.py
index 441f26a3f79..22ab1181bef 100644
--- a/tardis/montecarlo/montecarlo_transport_state.py
+++ b/tardis/montecarlo/montecarlo_transport_state.py
@@ -365,9 +365,7 @@ def virt_packet_initial_mus(self):
     @property
     def virt_packet_last_interaction_in_nu(self):
         try:
-            return u.Quantity(
-                self.vpacket_tracker.last_interaction_in_nu, u.erg
-            )
+            return u.Quantity(self.vpacket_tracker.last_interaction_in_nu, u.Hz)
         except AttributeError:
             warnings.warn(
                 "MontecarloTransport.virt_packet_last_interaction_in_nu:"
@@ -381,7 +379,7 @@ def virt_packet_last_interaction_in_nu(self):
     @property
     def virt_packet_last_interaction_type(self):
         try:
-            return u.Quantity(self.vpacket_tracker.last_interaction_type, u.erg)
+            return self.vpacket_tracker.last_interaction_type
         except AttributeError:
             warnings.warn(
                 "MontecarloTransport.virt_packet_last_interaction_type:"
@@ -395,9 +393,7 @@ def virt_packet_last_interaction_type(self):
     @property
     def virt_packet_last_line_interaction_in_id(self):
         try:
-            return u.Quantity(
-                self.vpacket_tracker.last_interaction_in_id, u.erg
-            )
+            return self.vpacket_tracker.last_interaction_in_id
         except AttributeError:
             warnings.warn(
                 "MontecarloTransport.virt_packet_last_line_interaction_in_id:"
@@ -411,9 +407,7 @@ def virt_packet_last_line_interaction_in_id(self):
     @property
     def virt_packet_last_line_interaction_out_id(self):
         try:
-            return u.Quantity(
-                self.vpacket_tracker.last_interaction_out_id, u.erg
-            )
+            return self.vpacket_tracker.last_interaction_out_id
         except AttributeError:
             warnings.warn(
                 "MontecarloTransport.virt_packet_last_line_interaction_out_id:"
@@ -427,9 +421,7 @@ def virt_packet_last_line_interaction_out_id(self):
     @property
     def virt_packet_last_line_interaction_shell_id(self):
         try:
-            return u.Quantity(
-                self.vpacket_tracker.last_interaction_shell_id, u.erg
-            )
+            return self.vpacket_tracker.last_interaction_shell_id
         except AttributeError:
             warnings.warn(
                 "MontecarloTransport.virt_packet_last_line_interaction_shell_id:"