diff --git a/app/src/full/java/com/topjohnwu/magisk/asyncs/InstallMagisk.java b/app/src/full/java/com/topjohnwu/magisk/asyncs/InstallMagisk.java
index 97aec05a1..ceccf23d3 100644
--- a/app/src/full/java/com/topjohnwu/magisk/asyncs/InstallMagisk.java
+++ b/app/src/full/java/com/topjohnwu/magisk/asyncs/InstallMagisk.java
@@ -147,7 +147,7 @@ public class InstallMagisk extends ParallelTask<Void, Void, Boolean> {
             console.add("- Downloading zip");
             HttpURLConnection conn = WebService.mustRequest(Data.magiskLink, null);
             buf = new BufferedInputStream(new ProgressStream(conn), conn.getContentLength());
-            buf.mark(conn.getContentLength());
+            buf.mark(conn.getContentLength() + 1);
             try (OutputStream out = new FileOutputStream(zip)) {
                 ShellUtils.pump(buf, out);
             }
@@ -156,7 +156,7 @@ public class InstallMagisk extends ParallelTask<Void, Void, Boolean> {
         } else {
             console.add("- Existing zip found");
             buf = new BufferedInputStream(new FileInputStream(zip), (int) zip.length());
-            buf.mark((int) zip.length());
+            buf.mark((int) zip.length() + 1);
         }
 
         console.add("- Extracting files");