diff --git a/simgear/structure/SGPerfMon.cxx b/simgear/structure/SGPerfMon.cxx
index 806ebe98..43fab6d2 100644
--- a/simgear/structure/SGPerfMon.cxx
+++ b/simgear/structure/SGPerfMon.cxx
@@ -34,7 +34,6 @@
 #include <simgear/sg_inlines.h>
 #include <simgear/debug/logstream.hxx>
 #include <simgear/math/sg_geodesy.hxx>
-#include <simgear/sound/soundmgr_openal.hxx>
 #include <simgear/structure/exception.hxx>
 
 using std::string;