diff --git a/Makefile b/Makefile
index 195573aab..c9d0ac442 100644
--- a/Makefile
+++ b/Makefile
@@ -115,7 +115,7 @@ GOFAIL_VERSION = $(shell cd tools/mod && go list -m -f {{.Version}} go.etcd.io/g
 
 .PHONY: gofail-enable
 gofail-enable: install-gofail
-	gofail enable server/etcdserver/ server/storage/backend/ server/storage/mvcc/
+	gofail enable server/etcdserver/ server/storage/backend/ server/storage/mvcc/ server/storage/wal/
 	cd ./server && go get go.etcd.io/gofail@${GOFAIL_VERSION}
 	cd ./etcdutl && go get go.etcd.io/gofail@${GOFAIL_VERSION}
 	cd ./etcdctl && go get go.etcd.io/gofail@${GOFAIL_VERSION}
@@ -123,7 +123,7 @@ gofail-enable: install-gofail
 
 .PHONY: gofail-disable
 gofail-disable: install-gofail
-	gofail disable server/etcdserver/ server/storage/backend/ server/storage/mvcc/
+	gofail disable server/etcdserver/ server/storage/backend/ server/storage/mvcc/ server/storage/wal/
 	cd ./server && go mod tidy
 	cd ./etcdutl && go mod tidy
 	cd ./etcdctl && go mod tidy
diff --git a/server/storage/wal/wal.go b/server/storage/wal/wal.go
index ff24ca86a..7f8b25f5d 100644
--- a/server/storage/wal/wal.go
+++ b/server/storage/wal/wal.go
@@ -950,7 +950,10 @@ func (w *WAL) Save(st raftpb.HardState, ents []raftpb.Entry) error {
 	}
 	if curOff < SegmentSizeBytes {
 		if mustSync {
-			return w.sync()
+			// gofail: var walBeforeSync struct{}
+			err = w.sync()
+			// gofail: var walAfterSync struct{}
+			return err
 		}
 		return nil
 	}