diff --git a/src/CardinalPlugin.cpp b/src/CardinalPlugin.cpp
index 63fe6c5..4c7c4b5 100644
--- a/src/CardinalPlugin.cpp
+++ b/src/CardinalPlugin.cpp
@@ -37,6 +37,7 @@
 #if defined(HAVE_LIBLO) && defined(HEADLESS)
 # include <lo/lo.h>
 # include "extra/Thread.hpp"
+# include "CardinalCommon.hpp"
 #endif
 
 #include <list>