diff --git a/include/utils/StringUtils.h b/include/utils/StringUtils.h
index 7f5b7f90..816d8353 100644
--- a/include/utils/StringUtils.h
+++ b/include/utils/StringUtils.h
@@ -43,3 +43,5 @@ String prettyBytes(size_t size);
 String uint64ToString(uint64_t input, uint8_t base = 10);
 
 void cleanString(String& str);
+
+unsigned char ChartoHex(char ch);