diff --git a/misc/scripts/png2c.py b/misc/scripts/png2c.py
index 5f451aa05d..fe96def079 100755
--- a/misc/scripts/png2c.py
+++ b/misc/scripts/png2c.py
@@ -56,8 +56,8 @@ for path in sys.argv[1:]:
 
         # Try to naively get its size if necessary
         if with_size:
-                width = bytes[19] + 16*bytes[18] + 256*bytes[17] + 4096*bytes[16]
-                height = bytes[23] + 16*bytes[22] + 256*bytes[21] + 4096*bytes[20]
+                width = bytes[19] + 16*bytes[18] + 256*bytes[17] + 65536*bytes[16]
+                height = bytes[23] + 16*bytes[22] + 256*bytes[21] + 65536*bytes[20]
                 size_suffix = "_%dx%d" % (width, height)
 
         # Create the C header