diff --git a/source/net/yacy/document/importer/MediawikiImporter.java b/source/net/yacy/document/importer/MediawikiImporter.java
index b9557f803..d0d64cc72 100644
--- a/source/net/yacy/document/importer/MediawikiImporter.java
+++ b/source/net/yacy/document/importer/MediawikiImporter.java
@@ -153,16 +153,6 @@ public class MediawikiImporter extends Thread implements Importer {
             if (p > 0) targetstub = targetstub.substring(0, p);
             InputStream is = new BufferedInputStream(new FileInputStream(this.sourcefile), 1024 * 1024);
             if (this.sourcefile.getName().endsWith(".bz2")) {
-                int b = is.read();
-                if (b != 'B') {
-                    try {is.close();} catch (final IOException e) {}
-                    throw new IOException("Invalid bz2 content.");
-                }
-                b = is.read();
-                if (b != 'Z') {
-                    try {is.close();} catch (final IOException e) {}
-                    throw new IOException("Invalid bz2 content.");
-                }
                 is = new BZip2CompressorInputStream(is);
             } else if (this.sourcefile.getName().endsWith(".gz")) {
                 is = new GZIPInputStream(is);