diff --git a/src/runtime/mgc.go b/src/runtime/mgc.go
index 0a4d5616a5..65ac654b14 100644
--- a/src/runtime/mgc.go
+++ b/src/runtime/mgc.go
@@ -983,7 +983,6 @@ var work struct {
 	nproc  uint32
 	tstart int64
 	nwait  uint32
-	ndone  uint32
 
 	// Number of roots of various root types. Set by gcMarkRootPrepare.
 	nFlushCacheRoots                               int