diff --git a/src/runtime/mcentral.go b/src/runtime/mcentral.go
index 29a7b77376..8a2fbe98c9 100644
--- a/src/runtime/mcentral.go
+++ b/src/runtime/mcentral.go
@@ -195,7 +195,6 @@ func (c *mcentral) freeSpan(s *mspan, n int32, start gclinkptr, end gclinkptr, p
 	s.needzero = 1
 	s.freelist = 0
 	unlock(&c.lock)
-	heapBitsForSpan(s.base()).initSpan(s.layout())
 	mheap_.freeSpan(s, 0)
 	return true
 }
diff --git a/src/runtime/mgcsweep.go b/src/runtime/mgcsweep.go
index b00ceb0a8a..d6d91d2021 100644
--- a/src/runtime/mgcsweep.go
+++ b/src/runtime/mgcsweep.go
@@ -276,7 +276,6 @@ func (s *mspan) sweep(preserve bool) bool {
 			if preserve {
 				throw("can't preserve large span")
 			}
-			heapBitsForSpan(p).initSpan(s.layout())
 			s.needzero = 1
 
 			// Free the span after heapBitsSweepSpan