diff --git a/src/headers/Yerbacon.hpp b/src/headers/Yerbacon.hpp
index 3fd9079..7242b1a 100644
--- a/src/headers/Yerbacon.hpp
+++ b/src/headers/Yerbacon.hpp
@@ -2,6 +2,7 @@
 #define YERBACON_HPP
 
 #ifndef YBCON_VERSION
+#warning "YBCON_VERSION is unknown and will therefore be set to a default value"
 #define YBCON_VERSION "UNKNOWN"
 #endif