diff --git a/src/pkg/sys/cmd_unix.go b/src/pkg/sys/cmd_unix.go
index 618e5141..01418be7 100644
--- a/src/pkg/sys/cmd_unix.go
+++ b/src/pkg/sys/cmd_unix.go
@@ -1,6 +1,5 @@
-// +build aix darwin dragonfly freebsd js,wasm linux netbsd openbsd solaris plan9
-
-// Unix environment variables.
+//go:build !windows
+// +build !windows
 
 package sys
 
diff --git a/src/pkg/sys/cmd_windows.go b/src/pkg/sys/cmd_windows.go
index 09278176..0ef38ba8 100644
--- a/src/pkg/sys/cmd_windows.go
+++ b/src/pkg/sys/cmd_windows.go
@@ -1,5 +1,3 @@
-// Windows environment variables.
-
 package sys
 
 import (
diff --git a/src/server/engine/cmd_unix.go b/src/server/engine/cmd_unix.go
new file mode 100644
index 00000000..8db35a7e
--- /dev/null
+++ b/src/server/engine/cmd_unix.go
@@ -0,0 +1,14 @@
+//go:build !windows
+// +build !windows
+
+package engine
+
+import (
+	"os/exec"
+	"syscall"
+)
+
+func startCmd(c *exec.Cmd) error {
+	c.SysProcAttr = &syscall.SysProcAttr{Setpgid: true}
+	return c.Start()
+}
diff --git a/src/server/engine/cmd_windows.go b/src/server/engine/cmd_windows.go
new file mode 100644
index 00000000..6e429514
--- /dev/null
+++ b/src/server/engine/cmd_windows.go
@@ -0,0 +1,7 @@
+package engine
+
+import "os/exec"
+
+func startCmd(c *exec.Cmd) error {
+	return c.Start()
+}
diff --git a/src/server/engine/notify.go b/src/server/engine/notify.go
index aef99c32..c921ebb0 100644
--- a/src/server/engine/notify.go
+++ b/src/server/engine/notify.go
@@ -242,7 +242,7 @@ func callScript(stdinBytes []byte) {
 	cmd.Stdout = &buf
 	cmd.Stderr = &buf
 
-	err := cmd.Start()
+	err := startCmd(cmd)
 	if err != nil {
 		logger.Errorf("event_notify: run cmd err: %v", err)
 		return