diff --git a/backend/memory/memory.go b/backend/memory/memory.go
index 80fc321f9..11c02d78a 100644
--- a/backend/memory/memory.go
+++ b/backend/memory/memory.go
@@ -482,7 +482,8 @@ func (f *Fs) Copy(ctx context.Context, src fs.Object, remote string) (fs.Object,
 	if od == nil {
 		return nil, fs.ErrorObjectNotFound
 	}
-	buckets.updateObjectData(dstBucket, dstPath, od)
+	odCopy := *od
+	buckets.updateObjectData(dstBucket, dstPath, &odCopy)
 	return f.NewObject(ctx, remote)
 }
 
diff --git a/fstest/fstests/fstests.go b/fstest/fstests/fstests.go
index 3e3237f1a..72527a1e4 100644
--- a/fstest/fstests/fstests.go
+++ b/fstest/fstests/fstests.go
@@ -1237,6 +1237,13 @@ func Run(t *testing.T, opt *Opt) {
 				// Check dst lightly - list above has checked ModTime/Hashes
 				assert.Equal(t, file2Copy.Path, dst.Remote())
 
+				// check that mutating dst does not mutate src
+				err = dst.SetModTime(ctx, fstest.Time("2004-03-03T04:05:06.499999999Z"))
+				if err != fs.ErrorCantSetModTimeWithoutDelete && err != fs.ErrorCantSetModTime {
+					assert.NoError(t, err)
+					assert.False(t, src.ModTime(ctx).Equal(dst.ModTime(ctx)), "mutating dst should not mutate src -- is it Copying by pointer?")
+				}
+
 				// Delete copy
 				err = dst.Remove(ctx)
 				require.NoError(t, err)