diff --git a/mongoose.c b/mongoose.c
index fbc85dce..70ea311e 100644
--- a/mongoose.c
+++ b/mongoose.c
@@ -15310,7 +15310,7 @@ void mg_lwip_if_remove_conn(struct mg_connection *nc);
 time_t mg_lwip_if_poll(struct mg_iface *iface, int timeout_ms);
 
 // If compiling for Mongoose OS.
-#ifdef MGOS_HAVE_CORE
+#ifdef MGOS
 extern void mgos_lock();
 extern void mgos_unlock();
 #else
diff --git a/src/common/platforms/lwip/mg_lwip_net_if.c b/src/common/platforms/lwip/mg_lwip_net_if.c
index 42aa1e3b..754ac2df 100644
--- a/src/common/platforms/lwip/mg_lwip_net_if.c
+++ b/src/common/platforms/lwip/mg_lwip_net_if.c
@@ -103,7 +103,7 @@ void mg_lwip_if_remove_conn(struct mg_connection *nc);
 time_t mg_lwip_if_poll(struct mg_iface *iface, int timeout_ms);
 
 // If compiling for Mongoose OS.
-#ifdef MGOS_HAVE_CORE
+#ifdef MGOS
 extern void mgos_lock();
 extern void mgos_unlock();
 #else