diff --git a/pygdtf/__init__.py b/pygdtf/__init__.py
index cadd406..75d24aa 100644
--- a/pygdtf/__init__.py
+++ b/pygdtf/__init__.py
@@ -1388,7 +1388,7 @@ def _read_xml(self, xml_node: "Element", xml_parent: Optional["Element"] = None)
                 grouped_breaks[key] += channel.offset
 
         self.dmx_breaks = [
-            DmxModeBreak(dmx_break, len(set(channel_offsets)))
+            DmxModeBreak(dmx_break, max(channel_offsets))
             for dmx_break, channel_offsets in grouped_breaks.items()
         ]