diff --git a/src/Internals/IndentedPrint.cpp b/src/Internals/IndentedPrint.cpp
index 3ecdea54..b2a9f5f6 100644
--- a/src/Internals/IndentedPrint.cpp
+++ b/src/Internals/IndentedPrint.cpp
@@ -17,7 +17,7 @@ void IndentedPrint::unindent() {
 }
 
 void IndentedPrint::setTabSize(uint8_t n) {
-  if (n < MAX_TAB_SIZE) tabSize = n;
+  if (n < MAX_TAB_SIZE) tabSize = n & MAX_TAB_SIZE;
 }
 
 size_t IndentedPrint::write(uint8_t c) {