diff --git a/src/nzg_spaces.c b/src/nzg_spaces.c
index 3d4637e..025e44c 100644
--- a/src/nzg_spaces.c
+++ b/src/nzg_spaces.c
@@ -42,7 +42,7 @@ msgSpace * msgSpaceCreate(
   }
 
   //on redimentionne l'element
-  if (ftruncate(mSFd, sizeof(PAGESIZE)) == -1){
+  if (ftruncate(mSFd, sizeof(* mSAddr)) == -1){
 	fprintf( stderr, "msgSpace resizing failed: %s\n",
 		strerror( errno ) );
 	return NULL;