diff --git a/src/library/loadlib.cpp b/src/library/loadlib.cpp
index c8bb566d..a22cc549 100644
--- a/src/library/loadlib.cpp
+++ b/src/library/loadlib.cpp
@@ -30,6 +30,7 @@ namespace
 #endif
 #else
 	std::string callsign = "";
+	std::string callsign_ext = "";
 #endif
 }