diff --git a/mmtf/api/mmtf_reader.py b/mmtf/api/mmtf_reader.py
index abeb688..23013c3 100644
--- a/mmtf/api/mmtf_reader.py
+++ b/mmtf/api/mmtf_reader.py
@@ -15,7 +15,7 @@ def get_coords(self):
         """Utility function to get the coordinates as a single list of tuples."""
         out_list = []
         for i in range(len(self.x_coord_list)):
-            out_list.append((self.x_coord_list[i],self.y_coord_list[i],self.z_coord_list,))
+            out_list.append((self.x_coord_list[i],self.y_coord_list[i],self.z_coord_list[i],))
         return out_list
 
     def get_bonds(self):