diff --git a/package/switch/src/switch-robo.c b/package/switch/src/switch-robo.c
index 95cb3e23f7..a0051a32fe 100644
--- a/package/switch/src/switch-robo.c
+++ b/package/switch/src/switch-robo.c
@@ -73,7 +73,7 @@
 extern char *nvram_get(const char *name);
 #define getvar(str) (nvram_get(str)?:"")
 #else
-#define getvar(str) NULL
+#define getvar(str) ""
 #endif
 
 /* Data structure for a Roboswitch device. */