diff --git a/src/Network/fgcom.cxx b/src/Network/fgcom.cxx
index 128e911..bddff70 100644
--- a/src/Network/fgcom.cxx
+++ b/src/Network/fgcom.cxx
@@ -43,6 +43,8 @@
 #include <iaxclient.h>
 
 
+#include <simgear/structure/exception.hxx>
+#include <simgear/structure/commands.hxx>
 
 #define NUM_CALLS 4
 #define MAX_GND_RANGE 10.0