diff --git a/src/nzg_iface.h b/src/nzg_iface.h
index 54ad591..69edfb3 100644
--- a/src/nzg_iface.h
+++ b/src/nzg_iface.h
@@ -6,6 +6,8 @@
 #define MSGSPACE_DEFAULT_MODE 0600
 
 typedef char * msgSpaceId;
+typedef char * msgSpaceListId;
+
 typedef char * msgSpaceListElemId;
 typedef char * msgSpacePoolDataId;
 typedef char * msgSpacePoolId;