diff --git a/imgui_draw.cpp b/imgui_draw.cpp
index 8ce1739f..3dd0a360 100644
--- a/imgui_draw.cpp
+++ b/imgui_draw.cpp
@@ -1429,7 +1429,10 @@ void ImDrawListSplitter::Split(ImDrawList* draw_list, int channels_count)
     IM_ASSERT(_Current == 0 && _Count <= 1 && "Nested channel splitting is not supported. Please use separate instances of ImDrawListSplitter.");
     int old_channels_count = _Channels.Size;
     if (old_channels_count < channels_count)
+    {
+        _Channels.reserve(channels_count); // Avoid over reserving since this is likely to stay stable
         _Channels.resize(channels_count);
+    }
     _Count = channels_count;
 
     // Channels[] (24/32 bytes each) hold storage that we'll swap with draw_list->_CmdBuffer/_IdxBuffer