diff --git a/rsocket-broker-frames/src/main/java/io/rsocket/broker/frames/FlyweightUtils.java b/rsocket-broker-frames/src/main/java/io/rsocket/broker/frames/FlyweightUtils.java
index d560e8a..0cafd60 100644
--- a/rsocket-broker-frames/src/main/java/io/rsocket/broker/frames/FlyweightUtils.java
+++ b/rsocket-broker-frames/src/main/java/io/rsocket/broker/frames/FlyweightUtils.java
@@ -36,6 +36,7 @@ static void encodeByteString(ByteBuf byteBuf, String s) {
 
 	static String decodeByteString(ByteBuf byteBuf, int offset) {
 		int length = byteBuf.getByte(offset);
+		length &= UNSIGNED_BYTE_MAX_VALUE;
 		offset += Byte.BYTES;
 
 		return byteBuf.toString(offset, length, StandardCharsets.UTF_8);
@@ -43,6 +44,7 @@ static String decodeByteString(ByteBuf byteBuf, int offset) {
 
 	static int decodeByteStringLength(ByteBuf byteBuf, int offset) {
 		int length = byteBuf.getByte(offset);
+		length &= UNSIGNED_BYTE_MAX_VALUE;
 		return Byte.BYTES + length;
 	}