diff --git a/src/internal/poll/sendfile_bsd.go b/src/internal/poll/sendfile_bsd.go
index 9eda85882ca..3ba30a2154c 100644
--- a/src/internal/poll/sendfile_bsd.go
+++ b/src/internal/poll/sendfile_bsd.go
@@ -23,7 +23,7 @@ func SendFile(dstFD *FD, src int, pos, remain int64) (int64, error) {
 		return 0, err
 	}
 
-	dst := int(dstFD.Sysfd)
+	dst := dstFD.Sysfd
 	var written int64
 	var err error
 	for remain > 0 {
diff --git a/src/internal/poll/sendfile_linux.go b/src/internal/poll/sendfile_linux.go
index d6442e86664..6e7852347b7 100644
--- a/src/internal/poll/sendfile_linux.go
+++ b/src/internal/poll/sendfile_linux.go
@@ -20,7 +20,7 @@ func SendFile(dstFD *FD, src int, remain int64) (int64, error) {
 		return 0, err
 	}
 
-	dst := int(dstFD.Sysfd)
+	dst := dstFD.Sysfd
 	var written int64
 	var err error
 	for remain > 0 {
diff --git a/src/internal/poll/sendfile_solaris.go b/src/internal/poll/sendfile_solaris.go
index 748c85131e6..0a884307bb1 100644
--- a/src/internal/poll/sendfile_solaris.go
+++ b/src/internal/poll/sendfile_solaris.go
@@ -24,7 +24,7 @@ func SendFile(dstFD *FD, src int, pos, remain int64) (int64, error) {
 		return 0, err
 	}
 
-	dst := int(dstFD.Sysfd)
+	dst := dstFD.Sysfd
 	var written int64
 	var err error
 	for remain > 0 {