diff --git a/src/runtime/mgc.go b/src/runtime/mgc.go
index 34b5b48..654fa41 100644
--- a/src/runtime/mgc.go
+++ b/src/runtime/mgc.go
@@ -1457,7 +1457,7 @@
 	lock(&mheap_.lock)
 	mheap_.sweepgen += 2
 	mheap_.sweepDrained = 0
-	mheap_.pagesSwept = 0
+	mheap_.pagesSwept.Store(0)
 	mheap_.sweepArenas = mheap_.allArenas
 	mheap_.reclaimIndex = 0
 	mheap_.reclaimCredit = 0
diff --git a/src/runtime/mgcpacer.go b/src/runtime/mgcpacer.go
index 3cd4ea2..f858ab0 100644
--- a/src/runtime/mgcpacer.go
+++ b/src/runtime/mgcpacer.go
@@ -751,7 +751,7 @@
 			// Avoid setting the sweep ratio extremely high
 			heapDistance = _PageSize
 		}
-		pagesSwept := atomic.Load64(&mheap_.pagesSwept)
+		pagesSwept := mheap_.pagesSwept.Load()
 		pagesInUse := mheap_.pagesInUse.Load()
 		sweepDistancePages := int64(pagesInUse) - int64(pagesSwept)
 		if sweepDistancePages <= 0 {
diff --git a/src/runtime/mgcsweep.go b/src/runtime/mgcsweep.go
index 1812644..78d1f33 100644
--- a/src/runtime/mgcsweep.go
+++ b/src/runtime/mgcsweep.go
@@ -245,7 +245,7 @@
 
 func (l *sweepLocker) sweepIsDone() {
 	if debug.gcpacertrace > 0 {
-		print("pacer: sweep done at heap size ", gcController.heapLive>>20, "MB; allocated ", (gcController.heapLive-mheap_.sweepHeapLiveBasis)>>20, "MB during sweep; swept ", mheap_.pagesSwept, " pages at ", mheap_.sweepPagesPerByte, " pages/byte\n")
+		print("pacer: sweep done at heap size ", gcController.heapLive>>20, "MB; allocated ", (gcController.heapLive-mheap_.sweepHeapLiveBasis)>>20, "MB during sweep; swept ", mheap_.pagesSwept.Load(), " pages at ", mheap_.sweepPagesPerByte, " pages/byte\n")
 	}
 }
 
@@ -408,7 +408,7 @@
 		traceGCSweepSpan(s.npages * _PageSize)
 	}
 
-	atomic.Xadd64(&mheap_.pagesSwept, int64(s.npages))
+	mheap_.pagesSwept.Add(int64(s.npages))
 
 	spc := s.spanclass
 	size := s.elemsize
@@ -724,7 +724,7 @@
 	// Fix debt if necessary.
 	newHeapLive := uintptr(atomic.Load64(&gcController.heapLive)-mheap_.sweepHeapLiveBasis) + spanBytes
 	pagesTarget := int64(mheap_.sweepPagesPerByte*float64(newHeapLive)) - int64(callerSweepPages)
-	for pagesTarget > int64(atomic.Load64(&mheap_.pagesSwept)-sweptBasis) {
+	for pagesTarget > int64(mheap_.pagesSwept.Load()-sweptBasis) {
 		if sweepone() == ^uintptr(0) {
 			mheap_.sweepPagesPerByte = 0
 			break
diff --git a/src/runtime/mheap.go b/src/runtime/mheap.go
index a787f67..27f6077 100644
--- a/src/runtime/mheap.go
+++ b/src/runtime/mheap.go
@@ -103,7 +103,7 @@
 	// the slope, it would create a discontinuity in debt if any
 	// progress has already been made.
 	pagesInUse         atomic.Uint64 // pages of spans in stats mSpanInUse
-	pagesSwept         uint64        // pages swept this cycle; updated atomically
+	pagesSwept         atomic.Uint64 // pages swept this cycle
 	pagesSweptBasis    uint64        // pagesSwept to use as the origin of the sweep ratio; updated atomically
 	sweepHeapLiveBasis uint64        // value of gcController.heapLive to use as the origin of sweep ratio; written with lock, read without
 	sweepPagesPerByte  float64       // proportional sweep ratio; written with lock, read without