diff --git a/config/config.go b/config/config.go
index 427e4da..95ace89 100644
--- a/config/config.go
+++ b/config/config.go
@@ -86,10 +86,12 @@ type (
 		}
 
 		Watchtower struct {
-			Enabled  bool          `envconfig:"DRONE_WATCHTOWER_ENABLED"`
-			Image    string        `envconfig:"DRONE_WATCHTOWER_IMAGE" default:"webhippie/watchtower"`
-			Interval int           `envconfig:"DRONE_WATCHTOWER_INTERVAL" default:"300"`
-			Timeout  time.Duration `envconfig:"DRONE_WATCHTOWER_TIMEOUT" default:"120m"`
+			Enabled       bool          `envconfig:"DRONE_WATCHTOWER_ENABLED"`
+			SignalEnabled bool          `envconfig:"DRONE_WATCHTOWER_SIGNAL_ENABLED" default:"true"`
+			Signal        string        `envconfig:"DRONE_WATCHTOWER_STOP_SIGNAL" default:"SIGHUP"`
+			Image         string        `envconfig:"DRONE_WATCHTOWER_IMAGE" default:"webhippie/watchtower"`
+			Interval      int           `envconfig:"DRONE_WATCHTOWER_INTERVAL" default:"300"`
+			Timeout       time.Duration `envconfig:"DRONE_WATCHTOWER_TIMEOUT" default:"120m"`
 		}
 
 		HTTP struct {
diff --git a/config/load_test.go b/config/load_test.go
index e9aeb5c..77a05f9 100644
--- a/config/load_test.go
+++ b/config/load_test.go
@@ -157,6 +157,8 @@ func TestLoad(t *testing.T) {
 		"DRONE_OPENSTACK_USERDATA":         "#cloud-init",
 		"DRONE_OPENSTACK_USERDATA_FILE":    "/path/to/cloud/init.yml",
 		"OS_REGION_NAME":                   "sto-01",
+		"DRONE_WATCHTOWER_SIGNAL_ENABLED":  "false",
+		"DRONE_WATCHTOWER_STOP_SIGNAL":     "",
 	}
 
 	defer func() {
diff --git a/engine/engine.go b/engine/engine.go
index 3e5b381..f32e134 100644
--- a/engine/engine.go
+++ b/engine/engine.go
@@ -58,32 +58,34 @@ func New(
 			client:   newDockerClient,
 		},
 		installer: &installer{
-			metrics:            metrics,
-			servers:            servers,
-			os:                 config.Agent.OS,
-			arch:               config.Agent.Arch,
-			image:              config.Agent.Image,
-			secret:             config.Agent.Token,
-			envs:               config.Agent.Environ,
-			volumes:            config.Agent.Volumes,
-			ports:              config.Agent.Ports,
-			labels:             config.Agent.Labels,
-			proto:              config.Server.Proto,
-			host:               config.Server.Host,
-			client:             newDockerClient,
-			runner:             config.Runner,
-			checkInterval:      config.Check.Interval,
-			checkDeadline:      config.Check.Deadline,
-			gcEnabled:          config.GC.Enabled,
-			gcDebug:            config.GC.Debug,
-			gcImage:            config.GC.Image,
-			gcIgnore:           config.GC.Images,
-			gcInterval:         config.GC.Interval,
-			gcCache:            config.GC.Cache,
-			watchtowerEnabled:  config.Watchtower.Enabled,
-			watchtowerImage:    config.Watchtower.Image,
-			watchtowerTimeout:  config.Watchtower.Timeout,
-			watchtowerInterval: config.Watchtower.Interval,
+			metrics:                 metrics,
+			servers:                 servers,
+			os:                      config.Agent.OS,
+			arch:                    config.Agent.Arch,
+			image:                   config.Agent.Image,
+			secret:                  config.Agent.Token,
+			envs:                    config.Agent.Environ,
+			volumes:                 config.Agent.Volumes,
+			ports:                   config.Agent.Ports,
+			labels:                  config.Agent.Labels,
+			proto:                   config.Server.Proto,
+			host:                    config.Server.Host,
+			client:                  newDockerClient,
+			runner:                  config.Runner,
+			checkInterval:           config.Check.Interval,
+			checkDeadline:           config.Check.Deadline,
+			gcEnabled:               config.GC.Enabled,
+			gcDebug:                 config.GC.Debug,
+			gcImage:                 config.GC.Image,
+			gcIgnore:                config.GC.Images,
+			gcInterval:              config.GC.Interval,
+			gcCache:                 config.GC.Cache,
+			watchtowerEnabled:       config.Watchtower.Enabled,
+			watchtowerImage:         config.Watchtower.Image,
+			watchtowerStopSignal:    config.Watchtower.Signal,
+			watchtowerSignalEnabled: config.Watchtower.SignalEnabled,
+			watchtowerTimeout:       config.Watchtower.Timeout,
+			watchtowerInterval:      config.Watchtower.Interval,
 		},
 		pinger: &pinger{
 			servers:  servers,
diff --git a/engine/install.go b/engine/install.go
index 9c1f786..b5c29b4 100644
--- a/engine/install.go
+++ b/engine/install.go
@@ -53,10 +53,12 @@ type installer struct {
 	gcInterval time.Duration
 	gcCache    string
 
-	watchtowerEnabled  bool
-	watchtowerImage    string
-	watchtowerInterval int
-	watchtowerTimeout  time.Duration
+	watchtowerEnabled       bool
+	watchtowerImage         string
+	watchtowerStopSignal    string
+	watchtowerSignalEnabled bool
+	watchtowerInterval      int
+	watchtowerTimeout       time.Duration
 
 	servers autoscaler.ServerStore
 	metrics metrics.Collector
@@ -234,8 +236,8 @@ poller:
 			Volumes:      toVol(volumes),
 			ExposedPorts: exposedPorts,
 			Labels: map[string]string{
-				"com.centurylinklabs.watchtower.enable":      "true",
-				"com.centurylinklabs.watchtower.stop-signal": "SIGHUP",
+				"com.centurylinklabs.watchtower.enable":      fmt.Sprint(i.watchtowerSignalEnabled),
+				"com.centurylinklabs.watchtower.stop-signal": i.watchtowerStopSignal,
 				"io.drone.agent.name":                        instance.Name,
 				"io.drone.agent.zone":                        instance.Region,
 				"io.drone.agent.size":                        instance.Size,
@@ -374,7 +376,7 @@ func (i *installer) setupGarbageCollector(ctx context.Context, client docker.API
 			Volumes:      toVol(vols),
 			Env:          envs,
 			Labels: map[string]string{
-				"com.centurylinklabs.watchtower.enable": "true",
+				"com.centurylinklabs.watchtower.enable": fmt.Sprint(i.watchtowerSignalEnabled),
 			},
 		},
 		&container.HostConfig{