1 files changed, 1 insertions, 2 deletions
diff --git a/src/XShm.c b/src/XShm.c
index 922b4cb..38efa9f 100644
--- a/src/XShm.c
+++ b/src/XShm.c
@@ -235,12 +235,11 @@ Status XShmAttach(Display *dpy, XShmSegmentInfo *shminfo)
 
     ShmCheckExtension (dpy, info, 0);
 
-    shminfo->shmseg = XAllocID(dpy);
     LockDisplay(dpy);
     GetReq(ShmAttach, req);
     req->reqType = info->codes->major_opcode;
     req->shmReqType = X_ShmAttach;
-    req->shmseg = shminfo->shmseg;
+    req->shmseg = shminfo->shmseg = XAllocID(dpy);
     req->shmid = shminfo->shmid;
     req->readOnly = shminfo->readOnly ? xTrue : xFalse;
     UnlockDisplay(dpy);