diff --git a/tools/releasetools/common.py b/tools/releasetools/common.py
index 50ef451..947a9e4 100644
--- a/tools/releasetools/common.py
+++ b/tools/releasetools/common.py
@@ -303,6 +303,11 @@
 
   cmd = [mkbootimg, "--kernel", os.path.join(sourcedir, "kernel")]
 
+  fn = os.path.join(sourcedir, "second")
+  if os.access(fn, os.F_OK):
+    cmd.append("--second")
+    cmd.append(fn)
+
   fn = os.path.join(sourcedir, "cmdline")
   if os.access(fn, os.F_OK):
     cmd.append("--cmdline")