diff --git a/src/nzg_spaces.c b/src/nzg_spaces.c
index 60fd64c..9185901 100644
--- a/src/nzg_spaces.c
+++ b/src/nzg_spaces.c
@@ -22,6 +22,7 @@ msgSpace * msgSpaceCreate(
   msgSpaceId nzgId;
   /* msgSpaceList mSList;  */
   int mSFd; // shm file descriptor
+  int mSPoolDataFd; // shm file descriptor
   int i;
   static int mSIdNum=-1;
   msgSpace * mSAddr;