diff --git a/src/os/exec_linux_test.go b/src/os/exec_linux_test.go
index faa10b65..affd45a3 100644
--- a/src/os/exec_linux_test.go
+++ b/src/os/exec_linux_test.go
@@ -3,6 +3,7 @@
 package os_test
 
 import (
+	"errors"
 	. "os"
 	"runtime"
 	"testing"
@@ -17,8 +18,8 @@ func TestForkExec(t *testing.T) {
 		return
 	}
 
-	proc, err := StartProcess("echo", []string{"echo", "hello", "world"}, &ProcAttr{})
-	if err != nil {
+	proc, err := StartProcess("/bin/echo", []string{"hello", "world"}, &ProcAttr{})
+	if !errors.Is(err, nil) {
 		t.Fatalf("forkExec failed: %v", err)
 		return
 	}
diff --git a/src/os/osexec.go b/src/os/osexec.go
index f92b796b..cf280fe8 100644
--- a/src/os/osexec.go
+++ b/src/os/osexec.go
@@ -14,7 +14,9 @@ func fork() (pid int, err error) {
 	ret, _, err := syscall.Syscall(syscall.SYS_FORK, 0, 0, 0)
 	if int(ret) != 0 {
 		errno := err.(syscall.Errno)
-		return 0, errno
+		if int(errno) != 0 {
+			return -1, errno
+		}
 	}
 	return int(ret), nil
 }