diff --git a/ethstorage/pora/ethash/mmap_help_linux.go b/ethstorage/pora/ethash/mmap_help_linux.go
index 30b1839e..6f4b3729 100644
--- a/ethstorage/pora/ethash/mmap_help_linux.go
+++ b/ethstorage/pora/ethash/mmap_help_linux.go
@@ -15,7 +15,6 @@
 // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
 
 //go:build linux
-// +build linux
 
 package pora
 
diff --git a/ethstorage/pora/ethash/mmap_help_other.go b/ethstorage/pora/ethash/mmap_help_other.go
index 7b97778b..d23b714e 100644
--- a/ethstorage/pora/ethash/mmap_help_other.go
+++ b/ethstorage/pora/ethash/mmap_help_other.go
@@ -15,7 +15,6 @@
 // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
 
 //go:build !linux
-// +build !linux
 
 package pora