diff --git a/apps/plugin.c b/apps/plugin.c
index 194ec34484..1198f93434 100644
--- a/apps/plugin.c
+++ b/apps/plugin.c
@@ -59,6 +59,7 @@
 #ifdef SIMULATOR
 static unsigned char pluginbuf[PLUGIN_BUFFER_SIZE];
 void *sim_plugin_load(char *plugin, int *fd);
+void sim_plugin_close(int fd);
 #else
 #define sim_plugin_close(x)
 extern unsigned char pluginbuf[];