diff --git a/utils/ECC/ECC.js b/utils/ECC/ECC.js
index 4e53a5b3..5420e93b 100644
--- a/utils/ECC/ECC.js
+++ b/utils/ECC/ECC.js
@@ -210,5 +210,11 @@ module.exports = {
   authorizeDevice,
   generateRandomString,
   nodeKeyPairs,
-  devicePublicKeys
+  devicePublicKeys,
+  /**
+   * Used for tests.
+   */
+  killECCCryptoSubprocess() {
+    cryptoSubprocess.kill()
+  }
 }
diff --git a/utils/ECC/ECC.spec.js b/utils/ECC/ECC.spec.js
index e088844a..60a7e013 100644
--- a/utils/ECC/ECC.spec.js
+++ b/utils/ECC/ECC.spec.js
@@ -12,7 +12,8 @@ const {
   decryptMessage,
   encryptMessage,
   generateKeyPair,
-  isAuthorizedDevice
+  isAuthorizedDevice,
+  killECCCryptoSubprocess
 } = require('./ECC')
 
 const uuid = () => {
@@ -118,4 +119,6 @@ describe('ECC', () => {
       expect(decrypted).toEqual(message)
     })
   })
+
+  after(killECCCryptoSubprocess)
 })
diff --git a/utils/ECC/crypto.js b/utils/ECC/crypto.js
index 7a4cb5c9..7f17e6f8 100644
--- a/utils/ECC/crypto.js
+++ b/utils/ECC/crypto.js
@@ -136,5 +136,11 @@ module.exports = {
   convertBufferToBase64,
   convertToEncryptedMessage,
   convertToEncryptedMessageResponse,
-  processKey
+  processKey,
+  /**
+   * Used for tests.
+   */
+  killCryptoCryptoSubprocess() {
+    cryptoSubprocess.kill()
+  }
 }
diff --git a/utils/ECC/crypto.spec.js b/utils/ECC/crypto.spec.js
index d367006d..1b9c3175 100644
--- a/utils/ECC/crypto.spec.js
+++ b/utils/ECC/crypto.spec.js
@@ -7,7 +7,8 @@ const expect = require('expect')
 const {
   generateRandomString,
   convertBase64ToBuffer,
-  convertBufferToBase64
+  convertBufferToBase64,
+  killCryptoCryptoSubprocess
 } = require('./crypto')
 
 describe('crypto', () => {
@@ -33,4 +34,6 @@ describe('crypto', () => {
       expect(asStringAgain).toEqual(rnd)
     })
   })
+
+  after(killCryptoCryptoSubprocess)
 })