diff --git a/simgear/ephemeris/sky.hxx b/simgear/ephemeris/sky.hxx
index 69567820..a63a826b 100644
--- a/simgear/ephemeris/sky.hxx
+++ b/simgear/ephemeris/sky.hxx
@@ -30,7 +30,7 @@
 #endif                                   
 
 
-#include <ssg.h>		// plib include
+#include <plib/ssg.h>		// plib include
 
 
 class fgSky : ssgLeaf