diff --git a/src/nzg_spaces.c b/src/nzg_spaces.c
index 728ac38..065a3db 100644
--- a/src/nzg_spaces.c
+++ b/src/nzg_spaces.c
@@ -99,7 +99,7 @@ msgSpace * msgSpaceCreate(
   }
   
   /* allocation de la bonne zone mémoire pour le poolData */
-  if (ftruncate(mSFd, poolNb*sizeof(* msgPoolData)) == -1){
+  if (ftruncate(mSPoolDataFd, poolNb*sizeof(msgPoolData)) == -1){
 	fprintf( stderr, "msgSpace resizing failed: %s\n",
 		strerror( errno ) );
 	return NULL;