diff --git a/src/WINNT/afsd/cm_ioctl.c b/src/WINNT/afsd/cm_ioctl.c
index 0bbe4d8f65..695d8334ac 100644
--- a/src/WINNT/afsd/cm_ioctl.c
+++ b/src/WINNT/afsd/cm_ioctl.c
@@ -1039,7 +1039,9 @@ long cm_IoctlDeleteMountPoint(struct smb_ioctl *ioctlp, struct cm_user *userp)
                           dscp, cp, NULL, TRUE);
 
   done1:
+    lock_ObtainMutex(&scp->mx);
     cm_SyncOpDone(scp, NULL, CM_SCACHESYNC_NEEDCALLBACK | CM_SCACHESYNC_GETSTATUS);
+    lock_ReleaseMutex(&scp->mx);
 
   done2:
     cm_ReleaseSCache(dscp);
@@ -1899,7 +1901,9 @@ long cm_IoctlDeletelink(struct smb_ioctl *ioctlp, struct cm_user *userp)
                           dscp, cp, NULL, TRUE);
 
   done1:
+    lock_ObtainMutex(&scp->mx);
     cm_SyncOpDone(scp, NULL, CM_SCACHESYNC_NEEDCALLBACK | CM_SCACHESYNC_GETSTATUS);
+    lock_ReleaseMutex(&scp->mx);
 
   done2:
     cm_ReleaseSCache(dscp);