diff --git a/wled00/util.cpp b/wled00/util.cpp
index 8a29131a..861f1ce4 100644
--- a/wled00/util.cpp
+++ b/wled00/util.cpp
@@ -213,7 +213,7 @@ void releaseJSONBufferLock()
 
 
 // extracts effect mode (or palette) name from names serialized string
-// caller must provide large enough buffer for name (including SR extensions)!
+// caller must provide large enough buffer for name (including SR extensions)! maxLen is (buffersize - 1)
 uint8_t extractModeName(uint8_t mode, const char *src, char *dest, uint8_t maxLen)
 {
   if (src == JSON_mode_names || src == nullptr) {
@@ -235,7 +235,7 @@ uint8_t extractModeName(uint8_t mode, const char *src, char *dest, uint8_t maxLe
 
   if (src == JSON_palette_names && mode > 255-customPalettes.size()) {
     snprintf_P(dest, maxLen, PSTR("~ Custom %d ~"), 255-mode);
-    dest[maxLen-1] = '\0';
+    dest[maxLen] = '\0';
     return strlen(dest);
   }