diff --git a/sootty/storage/wiregroup.py b/sootty/storage/wiregroup.py
index 162f890..a82b5f2 100644
--- a/sootty/storage/wiregroup.py
+++ b/sootty/storage/wiregroup.py
@@ -37,19 +37,12 @@ def find(self, name: str):
         raise SoottyError(f"Wire '{name}' does not exist.")
 
     def get_names(self):
-        """Returns a dictionary of all wire names of this wiregroup or a list if this wiregroup is the innermost one."""
-        if self.groups:
-            names = dict()
-            if self.wires:
-                names[self.name] = list()
-                for wire in self.wires:
-                    names[self.name].append(wire.name)
-            for group in self.groups:
-                names[group.name] = group.get_names()
-        else:
-            names = list()
-            for wire in self.wires:
-                names.append(wire.name)
+        """Returns list of all wire names."""
+        names = set()
+        for wire in self.wires:
+            names.add(wire.name)
+        for group in self.groups:
+            names.update(group.get_names())
         return names
     
     def get_wires(self):