diff --git a/kill.go b/kill.go
index c2d79296..25350f9f 100644
--- a/kill.go
+++ b/kill.go
@@ -9,6 +9,7 @@ import (
 	"syscall"
 
 	"github.com/urfave/cli"
+	"golang.org/x/sys/unix"
 )
 
 var killCommand = cli.Command{
@@ -60,8 +61,12 @@ func parseSignal(rawSignal string) (syscall.Signal, error) {
 	if err == nil {
 		return syscall.Signal(s), nil
 	}
-	signal, ok := signalMap[strings.TrimPrefix(strings.ToUpper(rawSignal), "SIG")]
-	if !ok {
+	sig := strings.ToUpper(rawSignal)
+	if !strings.HasPrefix(sig, "SIG") {
+		sig = "SIG" + sig
+	}
+	signal := unix.SignalNum(sig)
+	if signal == 0 {
 		return -1, fmt.Errorf("unknown signal %q", rawSignal)
 	}
 	return signal, nil
diff --git a/signalmap.go b/signalmap.go
deleted file mode 100644
index f9a63477..00000000
--- a/signalmap.go
+++ /dev/null
@@ -1,47 +0,0 @@
-// +build linux
-// +build !mips,!mipsle,!mips64,!mips64le
-
-package main
-
-import (
-	"syscall"
-
-	"golang.org/x/sys/unix"
-)
-
-var signalMap = map[string]syscall.Signal{
-	"ABRT":   unix.SIGABRT,
-	"ALRM":   unix.SIGALRM,
-	"BUS":    unix.SIGBUS,
-	"CHLD":   unix.SIGCHLD,
-	"CLD":    unix.SIGCLD,
-	"CONT":   unix.SIGCONT,
-	"FPE":    unix.SIGFPE,
-	"HUP":    unix.SIGHUP,
-	"ILL":    unix.SIGILL,
-	"INT":    unix.SIGINT,
-	"IO":     unix.SIGIO,
-	"IOT":    unix.SIGIOT,
-	"KILL":   unix.SIGKILL,
-	"PIPE":   unix.SIGPIPE,
-	"POLL":   unix.SIGPOLL,
-	"PROF":   unix.SIGPROF,
-	"PWR":    unix.SIGPWR,
-	"QUIT":   unix.SIGQUIT,
-	"SEGV":   unix.SIGSEGV,
-	"STKFLT": unix.SIGSTKFLT,
-	"STOP":   unix.SIGSTOP,
-	"SYS":    unix.SIGSYS,
-	"TERM":   unix.SIGTERM,
-	"TRAP":   unix.SIGTRAP,
-	"TSTP":   unix.SIGTSTP,
-	"TTIN":   unix.SIGTTIN,
-	"TTOU":   unix.SIGTTOU,
-	"URG":    unix.SIGURG,
-	"USR1":   unix.SIGUSR1,
-	"USR2":   unix.SIGUSR2,
-	"VTALRM": unix.SIGVTALRM,
-	"WINCH":  unix.SIGWINCH,
-	"XCPU":   unix.SIGXCPU,
-	"XFSZ":   unix.SIGXFSZ,
-}
diff --git a/signalmap_mipsx.go b/signalmap_mipsx.go
deleted file mode 100644
index 046bf152..00000000
--- a/signalmap_mipsx.go
+++ /dev/null
@@ -1,45 +0,0 @@
-// +build linux,mips linux,mipsle linux,mips64 linux,mips64le
-
-package main
-
-import (
-	"syscall"
-
-	"golang.org/x/sys/unix"
-)
-
-var signalMap = map[string]syscall.Signal{
-	"ABRT":   unix.SIGABRT,
-	"ALRM":   unix.SIGALRM,
-	"BUS":    unix.SIGBUS,
-	"CHLD":   unix.SIGCHLD,
-	"CLD":    unix.SIGCLD,
-	"CONT":   unix.SIGCONT,
-	"FPE":    unix.SIGFPE,
-	"HUP":    unix.SIGHUP,
-	"ILL":    unix.SIGILL,
-	"INT":    unix.SIGINT,
-	"IO":     unix.SIGIO,
-	"IOT":    unix.SIGIOT,
-	"KILL":   unix.SIGKILL,
-	"PIPE":   unix.SIGPIPE,
-	"POLL":   unix.SIGPOLL,
-	"PROF":   unix.SIGPROF,
-	"PWR":    unix.SIGPWR,
-	"QUIT":   unix.SIGQUIT,
-	"SEGV":   unix.SIGSEGV,
-	"STOP":   unix.SIGSTOP,
-	"SYS":    unix.SIGSYS,
-	"TERM":   unix.SIGTERM,
-	"TRAP":   unix.SIGTRAP,
-	"TSTP":   unix.SIGTSTP,
-	"TTIN":   unix.SIGTTIN,
-	"TTOU":   unix.SIGTTOU,
-	"URG":    unix.SIGURG,
-	"USR1":   unix.SIGUSR1,
-	"USR2":   unix.SIGUSR2,
-	"VTALRM": unix.SIGVTALRM,
-	"WINCH":  unix.SIGWINCH,
-	"XCPU":   unix.SIGXCPU,
-	"XFSZ":   unix.SIGXFSZ,
-}