diff --git a/atime_linux.go b/atime_atim.go
similarity index 82%
rename from atime_linux.go
rename to atime_atim.go
index e599d8b..947edda 100644
--- a/atime_linux.go
+++ b/atime_atim.go
@@ -1,3 +1,5 @@
+// +build linux dragonfly openbsd solaris
+
 package missinggo
 
 import (
diff --git a/atime_darwin.go b/atime_atimespec.go
similarity index 86%
rename from atime_darwin.go
rename to atime_atimespec.go
index 5ccbc43..d7c14dc 100644
--- a/atime_darwin.go
+++ b/atime_atimespec.go
@@ -1,3 +1,5 @@
+// +build darwin freebsd netbsd
+
 package missinggo
 
 import (
diff --git a/atime_freebsd.go b/atime_freebsd.go
deleted file mode 100644
index 5ccbc43..0000000
--- a/atime_freebsd.go
+++ /dev/null
@@ -1,12 +0,0 @@
-package missinggo
-
-import (
-	"os"
-	"syscall"
-	"time"
-)
-
-func fileInfoAccessTime(fi os.FileInfo) time.Time {
-	ts := fi.Sys().(*syscall.Stat_t).Atimespec
-	return time.Unix(int64(ts.Sec), int64(ts.Nsec))
-}
diff --git a/atime_netbsd.go b/atime_netbsd.go
deleted file mode 100644
index 5ccbc43..0000000
--- a/atime_netbsd.go
+++ /dev/null
@@ -1,12 +0,0 @@
-package missinggo
-
-import (
-	"os"
-	"syscall"
-	"time"
-)
-
-func fileInfoAccessTime(fi os.FileInfo) time.Time {
-	ts := fi.Sys().(*syscall.Stat_t).Atimespec
-	return time.Unix(int64(ts.Sec), int64(ts.Nsec))
-}