diff --git a/cmd/roaring-migrate/ctim_darwin.go b/cmd/roaring-migrate/ctim_darwin.go
new file mode 100644
index 000000000..0b50491ab
--- /dev/null
+++ b/cmd/roaring-migrate/ctim_darwin.go
@@ -0,0 +1,27 @@
+// Copyright 2017 Pilosa Corp.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// +build darwin
+
+package main
+
+import (
+	"syscall"
+)
+
+func CTimeNano(stat *syscall.Stat_t) int64 {
+	NANOS := int64(1e9) // number of nanosecs in 1 sec
+	ts := stat.Ctimespec
+	return ts.Sec*NANOS + ts.Nsec
+}
diff --git a/cmd/roaring-migrate/ctim_linux.go b/cmd/roaring-migrate/ctim_linux.go
new file mode 100644
index 000000000..b9e5d70e1
--- /dev/null
+++ b/cmd/roaring-migrate/ctim_linux.go
@@ -0,0 +1,25 @@
+// Copyright 2017 Pilosa Corp.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// +build linux
+
+package main
+
+import (
+	"syscall"
+)
+
+func CTimeNano(stat *syscall.Stat_t) int64 {
+	return stat.Ctim.Nano()
+}
diff --git a/cmd/roaring-migrate/main.go b/cmd/roaring-migrate/main.go
index 60ff5bf7c..8b5b62d6c 100644
--- a/cmd/roaring-migrate/main.go
+++ b/cmd/roaring-migrate/main.go
@@ -24,7 +24,7 @@ import (
 	"strings"
 	"syscall"
 
-	"github.com/molecula/featurebase/v2"
+	pilosa "github.com/molecula/featurebase/v2"
 	"github.com/molecula/featurebase/v2/rbf"
 	"github.com/molecula/featurebase/v2/rbf/cfg"
 	"github.com/molecula/featurebase/v2/roaring"
@@ -148,7 +148,7 @@ func BuildSchema(dataDir string) ([]byte, error) {
 					l = &local{
 						Name:      index,
 						Fields:    make([]*pilosa.FieldInfo, 0),
-						CreatedAt: uint64(stat.Ctim.Nano()),
+						CreatedAt: uint64(CTimeNano(stat)),
 						Options:   *io,
 					}
 					//index options
@@ -158,7 +158,7 @@ func BuildSchema(dataDir string) ([]byte, error) {
 
 				field := t[2]
 				if field != "_exists" {
-					fi, err := pilosa.UnmarshalFieldOptions(field, stat.Ctim.Nano(), content)
+					fi, err := pilosa.UnmarshalFieldOptions(field, CTimeNano(stat), content)
 					if err != nil {
 						return err
 					}