diff --git a/rtengine/simpleprocess.h b/rtengine/simpleprocess.h
index bc0675357..fb5a24ff6 100644
--- a/rtengine/simpleprocess.h
+++ b/rtengine/simpleprocess.h
@@ -18,8 +18,9 @@ extern "C" {
 #ifdef	__cplusplus
 }
 #endif
+namespace rtengine {
 
 extern Glib::Thread *batchThread;
-
+}
 #endif	/* SIMPLEPROCESS_H */