diff --git a/src/H5PartPrivate.h b/src/H5PartPrivate.h
index 5b64869..ac60b14 100644
--- a/src/H5PartPrivate.h
+++ b/src/H5PartPrivate.h
@@ -1,6 +1,7 @@
 #ifndef __H5PARTPRIVATE_H
 #define __H5PARTPRIVATE_H
 
+#define H5PART_PARTICLES_GROUP	"Particles"
 
 /*!
   The functions declared here are not part of the API, but may be used