diff --git a/build/shared/examples/08.Strings/StringLength/StringLength.ino b/build/shared/examples/08.Strings/StringLength/StringLength.ino
index 7d9cbb92cdb..35f315c7f51 100644
--- a/build/shared/examples/08.Strings/StringLength/StringLength.ino
+++ b/build/shared/examples/08.Strings/StringLength/StringLength.ino
@@ -13,7 +13,7 @@
*/
String txtMsg = ""; // a string for incoming text
-int lastStringLength = txtMsg.length(); // previous length of the String
+unsigned int lastStringLength = txtMsg.length(); // previous length of the String
void setup() {
// Open serial communications and wait for port to open:
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