diff --git a/src/PIL/FontFile.py b/src/PIL/FontFile.py
index 9621770e2..04616929a 100644
--- a/src/PIL/FontFile.py
+++ b/src/PIL/FontFile.py
@@ -65,7 +65,7 @@ class FontFile:
         ysize = lines * h
 
         if xsize == 0 and ysize == 0:
-            return ""
+            return
 
         self.ysize = h