diff --git a/lib/intval/index.js b/lib/intval/index.js
index 8c7c6e1..cbf2e44 100644
--- a/lib/intval/index.js
+++ b/lib/intval/index.js
@@ -43,6 +43,9 @@ class Intval {
 			}
 		}
 		this._declarePins()
+		process.on('SIGINT', () => {
+			this._undeclarePins()
+		})
 	}
 	_declarePins () {
 		this._pin.fwd = Gpio(4, 'out')
@@ -52,7 +55,13 @@ class Intval {
 
 		this._pin.release.watch(this._watchRelease)
 	}
-	_startFwd () {
+	_undeclarePins () {
+		this._pin.fwd.unexport()
+		this._pin.bwd.unexport()
+		this._pin.micro.unexport()
+		this._pin.release.unexport()
+	}
+ 	_startFwd () {
 		this._pin.fwd.set(1)
 		this._pin.bwd.set(0)
 		//start high-cpu watch