diff --git a/src/internal/poll/sendfile_bsd.go b/src/internal/poll/sendfile_bsd.go
index 980a75afa7..40ae3468b0 100644
--- a/src/internal/poll/sendfile_bsd.go
+++ b/src/internal/poll/sendfile_bsd.go
@@ -32,8 +32,7 @@ func SendFile(dstFD *FD, src int, pos, remain int64) (int64, error) {
 			pos += int64(n)
 			written += int64(n)
 			remain -= int64(n)
-		}
-		if n == 0 && err1 == nil {
+		} else if n == 0 && err1 == nil {
 			break
 		}
 		if err1 == syscall.EAGAIN {
diff --git a/src/internal/poll/sendfile_linux.go b/src/internal/poll/sendfile_linux.go
index 52955a19d0..8e938065f1 100644
--- a/src/internal/poll/sendfile_linux.go
+++ b/src/internal/poll/sendfile_linux.go
@@ -29,8 +29,7 @@ func SendFile(dstFD *FD, src int, remain int64) (int64, error) {
 		if n > 0 {
 			written += int64(n)
 			remain -= int64(n)
-		}
-		if n == 0 && err1 == nil {
+		} else if n == 0 && err1 == nil {
 			break
 		}
 		if err1 == syscall.EAGAIN {
diff --git a/src/internal/poll/sendfile_solaris.go b/src/internal/poll/sendfile_solaris.go
index 9093d46483..762992e9eb 100644
--- a/src/internal/poll/sendfile_solaris.go
+++ b/src/internal/poll/sendfile_solaris.go
@@ -39,8 +39,7 @@ func SendFile(dstFD *FD, src int, pos, remain int64) (int64, error) {
 			pos += int64(n)
 			written += int64(n)
 			remain -= int64(n)
-		}
-		if n == 0 && err1 == nil {
+		} else if n == 0 && err1 == nil {
 			break
 		}
 		if err1 == syscall.EAGAIN {