diff --git a/src/core/dmi.cc b/src/core/dmi.cc

index ced891a..e89ff93 100644

--- a/src/core/dmi.cc

+++ b/src/core/dmi.cc

@@ -1833,6 +1833,8 @@ static bool scan_dmi_sysfs(hwNode & n)

   ifstream ep_stream(SYSFSDMI "/smbios_entry_point",

       ifstream::in | ifstream::binary | ifstream::ate);

   ifstream::pos_type ep_len = ep_stream.tellg();

+  if (ep_len == -1)

+    return false;

   vector < u8 > ep_buf(ep_len);

   ep_stream.seekg(0, ifstream::beg);

   ep_stream.read((char *)ep_buf.data(), ep_len);