diff --git a/wled00/cfg.cpp b/wled00/cfg.cpp
index 54c32f9c..24e923c8 100644
--- a/wled00/cfg.cpp
+++ b/wled00/cfg.cpp
@@ -795,7 +795,7 @@ void serializeConfig() {
     matrix["psl"] = strip.panelO.serpentine;
 
     JsonArray panels = matrix.createNestedArray(F("panels"));
-    for (uint8_t i=0; i<strip.panel.size(); i++) {
+    for (size_t i = 0; i < strip.panel.size(); i++) {
       JsonObject pnl = panels.createNestedObject();
       pnl["b"] = strip.panel[i].bottomStart;
       pnl["r"] = strip.panel[i].rightStart;