diff --git a/lxd/images.go b/lxd/images.go
index 55bbbd4b35d2..f2b100c58154 100644
--- a/lxd/images.go
+++ b/lxd/images.go
@@ -839,6 +839,13 @@ func getImgPostInfo(s *state.State, r *http.Request, builddir string, project st
 		}
 	}
 
+	unlock, err := imageOperationLock(info.Fingerprint)
+	if err != nil {
+		return nil, err
+	}
+
+	defer unlock()
+
 	info.Architecture = imageMeta.Architecture
 	info.CreatedAt = time.Unix(imageMeta.CreationDate, 0)