diff --git a/src/runtime/mcentral.go b/src/runtime/mcentral.go
index bbbfb18fbf..5baaef99f8 100644
--- a/src/runtime/mcentral.go
+++ b/src/runtime/mcentral.go
@@ -160,7 +160,7 @@ func (c *mcentral) uncacheSpan(s *mspan) {
 // freeSpan returns true if s was returned to the heap.
 // If preserve=true, it does not move s (the caller
 // must take care of it).
-func (c *mcentral) freeSpan(s *mspan, start gclinkptr, end gclinkptr, preserve bool, wasempty bool) bool {
+func (c *mcentral) freeSpan(s *mspan, preserve bool, wasempty bool) bool {
 	if s.incache {
 		throw("freeSpan given cached span")
 	}
diff --git a/src/runtime/mgcsweep.go b/src/runtime/mgcsweep.go
index b1d6234af4..084d0a71c1 100644
--- a/src/runtime/mgcsweep.go
+++ b/src/runtime/mgcsweep.go
@@ -187,8 +187,6 @@ func (s *mspan) sweep(preserve bool) bool {
 	res := false
 	nfree := 0
 
-	var head, end gclinkptr
-
 	c := _g_.m.mcache
 	freeToHeap := false
 
@@ -292,7 +290,7 @@ func (s *mspan) sweep(preserve bool) bool {
 
 	if nfree > 0 && cl != 0 {
 		c.local_nsmallfree[cl] += uintptr(nfree)
-		res = mheap_.central[cl].mcentral.freeSpan(s, head, end, preserve, wasempty)
+		res = mheap_.central[cl].mcentral.freeSpan(s, preserve, wasempty)
 		// MCentral_FreeSpan updates sweepgen
 	} else if freeToHeap {
 		// Free large span to heap