diff --git a/src/include/netif/ppp/ppp_opts.h b/src/include/netif/ppp/ppp_opts.h
index 7f088c02..27943df1 100644
--- a/src/include/netif/ppp/ppp_opts.h
+++ b/src/include/netif/ppp/ppp_opts.h
@@ -72,8 +72,6 @@
 #define LWIP_PPP_API                    (PPP_SUPPORT && (NO_SYS == 0))
 #endif
 
-#if PPP_SUPPORT
-
 /**
  * MEMP_NUM_PPP_PCB: the number of simultaneously active PPP
  * connections (requires the PPP_SUPPORT option)
@@ -82,6 +80,8 @@
 #define MEMP_NUM_PPP_PCB       1
 #endif
 
+#if PPP_SUPPORT
+
 /**
  * MEMP_NUM_PPPOS_INTERFACES: the number of concurrently active PPPoS
  * interfaces (only used with PPPOS_SUPPORT==1)