diff --git a/props/dual_prop.h b/props/dual_prop.h
index d86e56dfc..fcd57065e 100644
--- a/props/dual_prop.h
+++ b/props/dual_prop.h
@@ -46,7 +46,7 @@ See here for setup info:
 https://pod.hubbe.net/howto/blade-id.html
 */
 
-#define DUAL_PROP_CONDITION blade_present()
+#define DUAL_PROP_CONDITION this->blade_present()
 
 #ifdef PROP_INHERIT_PREFIX
 #error dual_prop.h must be included first