diff --git a/libk3b/tools/k3biso9660backend.cpp b/libk3b/tools/k3biso9660backend.cpp
--- a/libk3b/tools/k3biso9660backend.cpp
+++ b/libk3b/tools/k3biso9660backend.cpp
@@ -131,7 +131,7 @@
     if( m_fd > 0 )
         return true;
     else {
-        m_fd = ::open( QFile::encodeName( m_filename ), O_RDONLY|O_LARGEFILE );
+        m_fd = ::open( QFile::encodeName( m_filename ), O_RDONLY|O_LARGEFILE|O_CLOEXEC );
         return ( m_fd > 0 );
     }
 }
diff --git a/libk3bdevice/k3bdevice.cpp b/libk3bdevice/k3bdevice.cpp
--- a/libk3bdevice/k3bdevice.cpp
+++ b/libk3bdevice/k3bdevice.cpp
@@ -171,7 +171,7 @@
 K3b::Device::Device::Handle K3b::Device::openDevice( const char* name, bool write )
 {
     K3b::Device::Device::Handle fd = HANDLE_DEFAULT_VALUE;
-    int flags = O_NONBLOCK;
+    int flags = O_NONBLOCK | O_CLOEXEC;
     if( write )
         flags |= O_RDWR;
     else