diff --git a/simgear/debug/logstream.hxx b/simgear/debug/logstream.hxx
index 3bc49a76..c4ea7834 100644
--- a/simgear/debug/logstream.hxx
+++ b/simgear/debug/logstream.hxx
@@ -322,6 +322,9 @@ sglog()
 # define SG_LOG(C,P,M) sglog() << loglevel(C,P) << M << endl
 #endif
 
+#define SG_STRINGIFY(x) #x
+#define SG_TOSTRING(x) SG_STRINGIFY(x)
+#define SG_ORIGIN __FILE__ ":" SG_TOSTRING(__LINE__)
 
 #endif // _LOGSTREAM_H