diff --git a/tools/viewer/ImGuiLayer.cpp b/tools/viewer/ImGuiLayer.cpp
index 3ed94a0..c6a95b4 100644
--- a/tools/viewer/ImGuiLayer.cpp
+++ b/tools/viewer/ImGuiLayer.cpp
@@ -122,8 +122,8 @@
 
         // De-interleave all vertex data (sigh), convert to Skia types
         pos.rewind(); uv.rewind(); color.rewind();
-        for (int i = 0; i < drawList->VtxBuffer.size(); ++i) {
-            const ImDrawVert& vert = drawList->VtxBuffer[i];
+        for (int j = 0; j < drawList->VtxBuffer.size(); ++j) {
+            const ImDrawVert& vert = drawList->VtxBuffer[j];
             pos.push_back(SkPoint::Make(vert.pos.x, vert.pos.y));
             uv.push_back(SkPoint::Make(vert.uv.x, vert.uv.y));
             color.push_back(vert.col);