diff --git a/Lib/fontTools/merge/__init__.py b/Lib/fontTools/merge/__init__.py
index fcc8a0dda..bbe330fa7 100644
--- a/Lib/fontTools/merge/__init__.py
+++ b/Lib/fontTools/merge/__init__.py
@@ -87,7 +87,7 @@ class Merger(object):
 			if cffTable:
 				# Rename CFF CharStrings to match the new glyphOrder.
 				# Using cffTable from before reloading the fonts, because reasons.
-				self._renameCFFCharStrings(glyphOrder, cffTable)
+				renameCFFCharStrings(self, glyphOrder, cffTable)
 				font['CFF '] = cffTable
 
 		mega = ttLib.TTFont(sfntVersion=sfntVersion)
@@ -129,15 +129,6 @@ class Merger(object):
 
 		return mega
 
-	def _renameCFFCharStrings(self, glyphOrder, cffTable):
-		"""Rename topDictIndex charStrings based on glyphOrder."""
-		td = cffTable.cff.topDictIndex[0]
-		charStrings = {}
-		for i, v in enumerate(td.CharStrings.charStrings.values()):
-			glyphName = glyphOrder[i]
-			charStrings[glyphName] = v
-		cffTable.cff.topDictIndex[0].CharStrings.charStrings = charStrings
-
 	def mergeObjects(self, returnTable, logic, tables):
 		# Right now we don't use self at all.  Will use in the future
 		# for options and logging.
@@ -244,7 +235,6 @@ class Merger(object):
 					markFilteringSetMap = NonhashableDict(GDEF.table.MarkGlyphSetsDef.Coverage)
 					t.table.LookupList.mapMarkFilteringSets(markFilteringSetMap)
 
-
 		# TODO FeatureParams nameIDs
 
 
diff --git a/Lib/fontTools/merge/cmap.py b/Lib/fontTools/merge/cmap.py
index 69d6e01de..458b34b03 100644
--- a/Lib/fontTools/merge/cmap.py
+++ b/Lib/fontTools/merge/cmap.py
@@ -113,4 +113,3 @@ def computeMegaCmap(merger, tables):
 					# TODO: Try harder to do something about these.
 					log.warning("Dropped mapping from codepoint %#06X to glyphId '%s'", uni, gid)
 
-
diff --git a/Lib/fontTools/merge/util.py b/Lib/fontTools/merge/util.py
index 202088361..7ddf51a15 100644
--- a/Lib/fontTools/merge/util.py
+++ b/Lib/fontTools/merge/util.py
@@ -194,3 +194,12 @@ class NonhashableDict(object):
 	def __delitem__(self, k):
 		del self.d[id(k)]
 
+
+def renameCFFCharStrings(merger, glyphOrder, cffTable):
+	"""Rename topDictIndex charStrings based on glyphOrder."""
+	td = cffTable.cff.topDictIndex[0]
+	charStrings = {}
+	for i, v in enumerate(td.CharStrings.charStrings.values()):
+		glyphName = glyphOrder[i]
+		charStrings[glyphName] = v
+	cffTable.cff.topDictIndex[0].CharStrings.charStrings = charStrings