diff --git a/hutool-core/src/main/java/cn/hutool/core/io/BOMInputStream.java b/hutool-core/src/main/java/cn/hutool/core/io/BOMInputStream.java
index b9bb4f28c530db38b45236a74169aeab0dd32b68..29d678e78a87e4715c1ded9037791f38e856536f 100644
--- a/hutool-core/src/main/java/cn/hutool/core/io/BOMInputStream.java
+++ b/hutool-core/src/main/java/cn/hutool/core/io/BOMInputStream.java
@@ -40,7 +40,7 @@ public class BOMInputStream extends InputStream {
 	}
 
 	public BOMInputStream(InputStream in, String defaultCharset) {
-		in = new PushbackInputStream(in, BOM_SIZE);
+		this.in = new PushbackInputStream(in, BOM_SIZE);
 		this.defaultCharset = defaultCharset;
 	}
 	// ----------------------------------------------------------------- Constructor end