diff --git a/store/atime_linux.go b/store/atime_linux.go
new file mode 100644
index 0000000..f3be390
--- /dev/null
+++ b/store/atime_linux.go
@@ -0,0 +1,17 @@
+// +build linux
+
+package store
+
+import (
+	"os"
+	"syscall"
+	"time"
+)
+
+func timespecToTime(ts syscall.Timespec) time.Time {
+	return time.Unix(int64(ts.Sec), int64(ts.Nsec))
+}
+
+func atime(fi os.FileInfo) time.Time {
+	return timespecToTime(fi.Sys().(*syscall.Stat_t).Atim)
+}
diff --git a/store/atime_universal.go b/store/atime_universal.go
new file mode 100644
index 0000000..237a013
--- /dev/null
+++ b/store/atime_universal.go
@@ -0,0 +1,12 @@
+// +build !linux
+
+package store
+
+import (
+	"os"
+	"time"
+)
+
+func atime(fi os.FileInfo) time.Time {
+	return fi.ModTime()
+}
diff --git a/store/disk.go b/store/disk.go
index 0dbc30d..b7dea85 100644
--- a/store/disk.go
+++ b/store/disk.go
@@ -227,11 +227,3 @@ func (d *DiskBlobStore) WipeOldestBlobs() (err error) {
 	}
 	return nil
 }
-
-func timespecToTime(ts syscall.Timespec) time.Time {
-	return time.Unix(int64(ts.Sec), int64(ts.Nsec))
-}
-
-func atime(fi os.FileInfo) time.Time {
-	return timespecToTime(fi.Sys().(*syscall.Stat_t).Atim)
-}