diff --git a/HellionChat/Util/ImGuiUtil.cs b/HellionChat/Util/ImGuiUtil.cs
index 6714aef..db36fe0 100755
--- a/HellionChat/Util/ImGuiUtil.cs
+++ b/HellionChat/Util/ImGuiUtil.cs
@@ -786,9 +786,14 @@ internal static class ImGuiUtil
 
     private static unsafe int CalcWordWrap(byte* basePtr, int start, int end, float width)
     {
+        var font = ImGui.GetFont();
+        // ImGui reads this as size / FontSize (imgui_draw.cpp, CalcTextSizeA), not
+        // as UI scale. The two match only while every font is built at
+        // SizePx * GlobalScale, which stops holding the moment a second size
+        // enters a line.
         var result = ImGuiNative.CalcWordWrapPositionA(
-            ImGui.GetFont().Handle,
-            ImGuiHelpers.GlobalScale,
+            font.Handle,
+            ImGui.GetFontSize() / font.FontSize,
             basePtr + start,
             basePtr + end,
             width