diff --git a/reactos/dll/win32/dhcpcsvc/dhcp/adapter.c b/reactos/dll/win32/dhcpcsvc/dhcp/adapter.c
index 5b58ed76465..5cd080f4fa7 100644
--- a/reactos/dll/win32/dhcpcsvc/dhcp/adapter.c
+++ b/reactos/dll/win32/dhcpcsvc/dhcp/adapter.c
@@ -22,6 +22,7 @@ PCHAR *GetSubkeyNames( PCHAR MainKeyName, PCHAR Append ) {
           &MaxSubKeys, &MaxSubKeyLen,
           NULL, NULL, NULL, NULL, NULL, NULL );
 
+    MaxSubKeyLen++;
     DH_DbgPrint(MID_TRACE,("MaxSubKeys: %d, MaxSubKeyLen %d\n",
                            MaxSubKeys, MaxSubKeyLen));