diff --git a/src/include/netif/ppp/ppp_opts.h b/src/include/netif/ppp/ppp_opts.h
index 6f1ff0ea..6702bec6 100644
--- a/src/include/netif/ppp/ppp_opts.h
+++ b/src/include/netif/ppp/ppp_opts.h
@@ -72,6 +72,8 @@
 #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)
@@ -92,8 +94,6 @@
 /* The number of sys_timeouts required for the PPP module */
 #define PPP_NUM_TIMEOUTS                (PPP_SUPPORT * PPP_NUM_TIMEOUTS_PER_PCB * MEMP_NUM_PPP_PCB)
 
-#if PPP_SUPPORT
-
 /**
  * MEMP_NUM_PPPOS_INTERFACES: the number of concurrently active PPPoS
  * interfaces (only used with PPPOS_SUPPORT==1)
@@ -602,4 +602,9 @@
 
 #endif /* PPP_SUPPORT */
 
+/* Default value if unset */
+#ifndef PPP_NUM_TIMEOUTS
+#define PPP_NUM_TIMEOUTS                0
+#endif /* PPP_NUM_TIMEOUTS */
+
 #endif /* LWIP_PPP_OPTS_H */