diff --git a/container/initplace.go b/container/initplace.go
index ce7ad86..9114694 100644
--- a/container/initplace.go
+++ b/container/initplace.go
@@ -4,7 +4,6 @@ import (
 	"encoding/gob"
 	"fmt"
 	"os"
-	"slices"
 	. "syscall"
 )
 
@@ -73,7 +72,8 @@ func (t *TmpfileOp) apply(state *setupState) error {
 
 func (t *TmpfileOp) Is(op Op) bool {
 	vt, ok := op.(*TmpfileOp)
-	return ok && t.Path == vt.Path && slices.Equal(t.Data, vt.Data)
+	return ok && t.Path != nil && vt.Path != nil && t.Path.Is(vt.Path) &&
+		string(t.Data) == string(vt.Data)
 }
 func (*TmpfileOp) prefix() string { return "placing" }
 func (t *TmpfileOp) String() string {
diff --git a/container/initplace_test.go b/container/initplace_test.go
new file mode 100644
index 0000000..e1d8163
--- /dev/null
+++ b/container/initplace_test.go
@@ -0,0 +1,56 @@
+package container
+
+import "testing"
+
+func TestTmpfileOp(t *testing.T) {
+	checkOpsBuilder(t, []opsBuilderTestCase{
+		{"noref", new(Ops).Place(MustAbs("/etc/passwd"), []byte(`chronos:x:65534:65534:Hakurei:/var/empty:/bin/zsh`)), Ops{
+			&TmpfileOp{
+				Path: MustAbs("/etc/passwd"),
+				Data: []byte(`chronos:x:65534:65534:Hakurei:/var/empty:/bin/zsh`),
+			},
+		}},
+
+		{"ref", new(Ops).PlaceP(MustAbs("/etc/passwd"), new(*[]byte)), Ops{
+			&TmpfileOp{
+				Path: MustAbs("/etc/passwd"),
+				Data: []byte{},
+			},
+		}},
+	})
+
+	checkOpIs(t, []opIsTestCase{
+		{"zero", new(TmpfileOp), new(TmpfileOp), false},
+
+		{"differs path", &TmpfileOp{
+			Path: MustAbs("/etc/group"),
+			Data: []byte(`chronos:x:65534:65534:Hakurei:/var/empty:/bin/zsh`),
+		}, &TmpfileOp{
+			Path: MustAbs("/etc/passwd"),
+			Data: []byte(`chronos:x:65534:65534:Hakurei:/var/empty:/bin/zsh`),
+		}, false},
+
+		{"differs data", &TmpfileOp{
+			Path: MustAbs("/etc/passwd"),
+			Data: []byte(`chronos:x:65534:65534:Hakurei:/var/empty:/bin/zsh` + "\x00"),
+		}, &TmpfileOp{
+			Path: MustAbs("/etc/passwd"),
+			Data: []byte(`chronos:x:65534:65534:Hakurei:/var/empty:/bin/zsh`),
+		}, false},
+
+		{"equals", &TmpfileOp{
+			Path: MustAbs("/etc/passwd"),
+			Data: []byte(`chronos:x:65534:65534:Hakurei:/var/empty:/bin/zsh`),
+		}, &TmpfileOp{
+			Path: MustAbs("/etc/passwd"),
+			Data: []byte(`chronos:x:65534:65534:Hakurei:/var/empty:/bin/zsh`),
+		}, true},
+	})
+
+	checkOpMeta(t, []opMetaTestCase{
+		{"passwd", &TmpfileOp{
+			Path: MustAbs("/etc/passwd"),
+			Data: []byte(`chronos:x:65534:65534:Hakurei:/var/empty:/bin/zsh`),
+		}, "placing", `tmpfile "/etc/passwd" (49 bytes)`},
+	})
+}