diff --git a/artiq/dashboard/waveform.py b/artiq/dashboard/waveform.py
index 26931d974..4345d3787 100644
--- a/artiq/dashboard/waveform.py
+++ b/artiq/dashboard/waveform.py
@@ -518,7 +518,7 @@ class _WaveformModel(QtCore.QAbstractTableModel):
     def move(self, src, dest):
         if src == dest:
             return
-        if dest == src + 1:
+        if src < dest:
             dest, src = src, dest
         self.beginMoveRows(QtCore.QModelIndex(), src, src, QtCore.QModelIndex(), dest)
         self.backing_struct.insert(dest, self.backing_struct.pop(src))