diff --git a/imgui_draw.cpp b/imgui_draw.cpp
index 0823b01e0ed2..fcbe5d92a2a2 100644
--- a/imgui_draw.cpp
+++ b/imgui_draw.cpp
@@ -573,7 +573,7 @@ int ImDrawList::_CalcCircleAutoSegmentCount(float radius) const
 {
     // Automatic segment count
     const int radius_idx = (int)(radius + 0.999999f); // ceil to never reduce accuracy
-    if (radius_idx < IM_ARRAYSIZE(_Data->CircleSegmentCounts))
+    if (radius_idx >= 0 && radius_idx < IM_ARRAYSIZE(_Data->CircleSegmentCounts))
         return _Data->CircleSegmentCounts[radius_idx]; // Use cached value
     else
         return IM_DRAWLIST_CIRCLE_AUTO_SEGMENT_CALC(radius, _Data->CircleSegmentMaxError);