diff --git a/src/server/sentry.qc b/src/server/sentry.qc
index bd614a6..cf5bb75 100644
--- a/src/server/sentry.qc
+++ b/src/server/sentry.qc
@@ -25,8 +25,18 @@ TFCSentry:NSSurfacePropEntity
 
 	virtual void(player) Place;
 	virtual void(void) FinishPlacing;
+	virtual void(void) Think;
 };
 
+void
+TFCSentry::Think(void)
+{
+	float twist = sin(time);
+	m_eHead.SetBoneControl1(twist);
+	m_eHead.SetBoneControl2(0.5f);
+	nextthink = time + 0.1f;
+}
+
 void
 TFCSentry::Place(player pl)
 {
@@ -56,6 +66,8 @@ TFCSentry::FinishPlacing(void)
 	m_eHead.SetSize([-16,-16,0], [16,16,32]);
 	m_eHead.SetOrigin(GetOrigin() + [0,0,20]);
 	m_eHead.colormap = colormap;
+	think = Think;
+	nextthink = time + 0.1f;
 
 	env_message_single(real_owner, "#Sentry_finish");
 	Sound_Play(this, CHAN_BODY, "engineer.turret_set");