diff --git a/go.sum b/go.sum
index 31590b0..0b17048 100644
--- a/go.sum
+++ b/go.sum
@@ -41,6 +41,8 @@ golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a/go.mod h1:oPkhp1MJrh7nUepCBc
 golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.2.0 h1:ljd4t30dBnAvMZaQCevtY0xLLD0A+bRZXbgLMLU1F/A=
 golang.org/x/sys v0.2.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.2.0 h1:ljd4t30dBnAvMZaQCevtY0xLLD0A+bRZXbgLMLU1F/A=
+golang.org/x/sys v0.2.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
diff --git a/internal/zencmd/window_darwin.go b/internal/zencmd/window_darwin.go
index 70ab603..2a5e5e0 100644
--- a/internal/zencmd/window_darwin.go
+++ b/internal/zencmd/window_darwin.go
@@ -1,6 +1,7 @@
 package zencmd
 
 import (
+	"math"
 	"strconv"
 
 	"golang.org/x/sys/unix"
@@ -11,7 +12,7 @@ type any = interface{}
 // ParseWindowId is internal.
 func ParseWindowId(id string) any {
 	if pid, err := strconv.ParseUint(id, 0, 64); err == nil {
-		return int(pid)
+		return int(pid & math.MaxInt)
 	}
 	return id
 }
diff --git a/internal/zencmd/window_unix.go b/internal/zencmd/window_unix.go
index c20fe3b..1b98254 100644
--- a/internal/zencmd/window_unix.go
+++ b/internal/zencmd/window_unix.go
@@ -6,6 +6,7 @@ import (
 	"bytes"
 	"fmt"
 	"io"
+	"math"
 	"os/exec"
 	"strconv"
 	"strings"
@@ -14,7 +15,7 @@ import (
 // ParseWindowId is internal.
 func ParseWindowId(id string) int {
 	wid, _ := strconv.ParseUint(id, 0, 64)
-	return int(wid)
+	return int(wid & math.MaxInt)
 }
 
 // GetParentWindowId is internal.