diff --git a/y/y.go b/y/y.go
index df3b8520c..b68246560 100644
--- a/y/y.go
+++ b/y/y.go
@@ -75,7 +75,7 @@ func CreateSyncedFile(filename string, sync bool) (*os.File, error) {
 	if sync {
 		flags |= datasyncFileFlag
 	}
-	return os.OpenFile(filename, flags, 0666)
+	return os.OpenFile(filename, flags, 0600)
 }
 
 // OpenSyncedFile creates the file if one doesn't exist.
@@ -84,7 +84,7 @@ func OpenSyncedFile(filename string, sync bool) (*os.File, error) {
 	if sync {
 		flags |= datasyncFileFlag
 	}
-	return os.OpenFile(filename, flags, 0666)
+	return os.OpenFile(filename, flags, 0600)
 }
 
 // OpenTruncFile opens the file with O_RDWR | O_CREATE | O_TRUNC
@@ -93,7 +93,7 @@ func OpenTruncFile(filename string, sync bool) (*os.File, error) {
 	if sync {
 		flags |= datasyncFileFlag
 	}
-	return os.OpenFile(filename, flags, 0666)
+	return os.OpenFile(filename, flags, 0600)
 }
 
 // SafeCopy does append(a[:0], src...).