diff --git a/Lib/fontTools/subset.py b/Lib/fontTools/subset.py
index eb21076ff..36a349ef2 100644
--- a/Lib/fontTools/subset.py
+++ b/Lib/fontTools/subset.py
@@ -1155,7 +1155,7 @@ def closure_glyphs(self, s):
       if g not in self.glyphs:
         continue
       gl = self.glyphs[g]
-      for c in gl.getComponents(self):
+      for c in gl.getComponentNames(self):
         if c not in s.glyphs:
           components.add(c)
     components = set(c for c in components if c not in s.glyphs)
diff --git a/Lib/fontTools/ttLib/tables/_g_l_y_f.py b/Lib/fontTools/ttLib/tables/_g_l_y_f.py
index f5ab386d5..2b1e1a1f8 100644
--- a/Lib/fontTools/ttLib/tables/_g_l_y_f.py
+++ b/Lib/fontTools/ttLib/tables/_g_l_y_f.py
@@ -606,10 +606,10 @@ class Glyph:
 		else:
 			return GlyphCoordinates(), [], array.array("B")
 
-	def getComponents(self, glyfTable):
+	def getComponentNames(self, glyfTable):
 		if not hasattr(self, "data"):
 			if self.isComposite():
-				return self.components
+				return [c.glyphName for c in self.components]
 			else:
 				return []