diff --git a/bluecellulab/circuit/circuit_access.py b/bluecellulab/circuit/circuit_access.py
index 36e5ceff..a2d4a3b5 100644
--- a/bluecellulab/circuit/circuit_access.py
+++ b/bluecellulab/circuit/circuit_access.py
@@ -605,8 +605,7 @@ def extract_synapses(
                 )
 
                 # add source_population_name as a column
-                source_population_name = edges[edge_population_name].source.name
-                synapses["source_population_name"] = source_population_name
+                synapses["source_population_name"] = edges[edge_population_name].source.name
 
                 # py-neurodamus
                 dt = neuron.h.dt