diff --git a/src/Aircraft/aircraft.cxx b/src/Aircraft/aircraft.cxx
index a3fcd9e47..23da8375b 100644
--- a/src/Aircraft/aircraft.cxx
+++ b/src/Aircraft/aircraft.cxx
@@ -25,7 +25,6 @@
 #include <string.h>		// strdup
 
 #include <plib/ul.h>
-#include <plib/ssg.h>
 
 #include <simgear/constants.h>
 #include <simgear/debug/logstream.hxx>