diff --git a/tools/analyze_mcu_flash_usage_treemap.html b/tools/analyze_mcu_flash_usage_treemap.html
index 6f9ae497..9d27fc95 100644
--- a/tools/analyze_mcu_flash_usage_treemap.html
+++ b/tools/analyze_mcu_flash_usage_treemap.html
@@ -168,7 +168,7 @@ function renderJson(root) {
   // Aggregate the values for internal nodes. This is normally done by the
   // treemap layout, but not here because of our custom implementation.
   // We also take a snapshot of the original children (_children) to avoid
-  // the children being overwritten when when layout is computed.
+  // the children being overwritten when layout is computed.
   function accumulate(d) {
     return (d._children = d.children)
         ? d.value = d.children.reduce(function(p, v) { return p + accumulate(v); }, 0)