diff --git a/spine-ts/spine-core/src/SkeletonBinary.ts b/spine-ts/spine-core/src/SkeletonBinary.ts
index f61e80788..4b1b1daba 100644
--- a/spine-ts/spine-core/src/SkeletonBinary.ts
+++ b/spine-ts/spine-core/src/SkeletonBinary.ts
@@ -1022,7 +1022,7 @@ export class BinaryInput {
 		let chars = "";
 		let charCount = 0;
 		for (let i = 0; i < byteCount;) {
-			let b = this.readByte();
+			let b = this.readUnsignedByte();
 			switch (b >> 4) {
 				case 12:
 				case 13: