diff --git a/unix/syscall_unix_test.go b/unix/syscall_unix_test.go
index 0e6f1c7b..0d1c87ce 100644
--- a/unix/syscall_unix_test.go
+++ b/unix/syscall_unix_test.go
@@ -169,6 +169,11 @@ func TestPassFD(t *testing.T) {
 		t.Skip("cannot exec subprocess on iOS, skipping test")
 	}
 
+	if os.Getenv("GO_WANT_HELPER_PROCESS") == "1" {
+		passFDChild()
+		return
+	}
+
 	if runtime.GOOS == "aix" {
 		// Unix network isn't properly working on AIX
 		// 7.2 with Technical Level < 2
@@ -190,11 +195,6 @@ func TestPassFD(t *testing.T) {
 		}
 	}
 
-	if os.Getenv("GO_WANT_HELPER_PROCESS") == "1" {
-		passFDChild()
-		return
-	}
-
 	tempDir, err := ioutil.TempDir("", "TestPassFD")
 	if err != nil {
 		t.Fatal(err)