diff --git a/src/free.c b/src/free.c
index ae51825..84036e9 100644
--- a/src/free.c
+++ b/src/free.c
@@ -61,6 +61,13 @@ sem_t * poolDataTabSemFd;
   printf("Freing pool: %d, buffer: %d\n",poolIndex,bufferIndex);
   msgBufferDetachProc(poolDataTabAddr,poolIndex,bufferIndex,addr);
 
+  /* unmapper le buffer */
+  void * realAddr=addr;
+  int bufferSize=poolDataTabAddr[poolIndex].bufferSize;
+  int bufferNb=poolDataTabAddr[poolIndex].bufferNb;
+  realAddr=realAddr-poolIndex*bufferSize;
+  munmap(realAddr,bufferSize*bufferNb);
+  
   /* unmapper le msgPoolDataTab */
   munmap(poolDataTabAddr,(space->poolNb) * sizeof( msgPoolData ));
 
@@ -75,14 +82,12 @@ sem_t * poolDataTabSemFd;
   ressourceSemFd = sem_open(ressourceSemId,O_CREAT,SEM_DEFAULT_MODE,0);
   if (ressourceSemFd == SEM_FAILED){ 
 	NZG_ERROR("sem_open",ressourceSemId);
-	return -1; 
+	goto ERROR;
   }
   sem_post(ressourceSemFd);
   sem_close(ressourceSemFd);
-
-  //sem_open ressource
-  //sem_post
-  //sem_close
   return 0;
+ERROR:
+  return -1;
 }