diff --git a/tests/unittests/tests-crypto/tests-crypto-helper.c b/tests/unittests/tests-crypto/tests-crypto-helper.c
new file mode 100644
index 0000000000..c9cf8d781a
--- /dev/null
+++ b/tests/unittests/tests-crypto/tests-crypto-helper.c
@@ -0,0 +1,38 @@
+/*
+ * Copyright (C) 2018 Koen Zandberg
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+#include <string.h>
+
+#include "embUnit/embUnit.h"
+#include "crypto/helper.h"
+
+#define VALUE       0xAA
+
+/* Secret to wipe */
+static uint8_t secret[20];
+
+void test_crypto_wipe(void)
+{
+    memset(secret, VALUE, sizeof(secret));
+    /* Wipe everything except the last byte */
+    crypto_secure_wipe(secret, sizeof(secret) - 1);
+    for (size_t i = 0; i < (sizeof(secret) - 1); i++) {
+        TEST_ASSERT_EQUAL_INT(0, secret[i]);
+    }
+    /* Check last byte */
+    TEST_ASSERT_EQUAL_INT(VALUE, secret[19]);
+}
+
+Test *tests_crypto_helper_tests(void)
+{
+    EMB_UNIT_TESTFIXTURES(fixtures) {
+        new_TestFixture(test_crypto_wipe),
+    };
+    EMB_UNIT_TESTCALLER(crypto_helper_tests, NULL, NULL, fixtures);
+    return (Test *) &crypto_helper_tests;
+}
diff --git a/tests/unittests/tests-crypto/tests-crypto.c b/tests/unittests/tests-crypto/tests-crypto.c
index d1c1ce2aaf..38910467b2 100644
--- a/tests/unittests/tests-crypto/tests-crypto.c
+++ b/tests/unittests/tests-crypto/tests-crypto.c
@@ -11,6 +11,7 @@
 
 void tests_crypto(void)
 {
+    TESTS_RUN(tests_crypto_helper_tests());
     TESTS_RUN(tests_crypto_chacha_tests());
     TESTS_RUN(tests_crypto_aes_tests());
     TESTS_RUN(tests_crypto_cipher_tests());
diff --git a/tests/unittests/tests-crypto/tests-crypto.h b/tests/unittests/tests-crypto/tests-crypto.h
index db49773288..aa25a82a89 100644
--- a/tests/unittests/tests-crypto/tests-crypto.h
+++ b/tests/unittests/tests-crypto/tests-crypto.h
@@ -33,6 +33,12 @@ extern "C" {
  */
 void tests_crypto(void);
 
+/**
+ * @brief   Generates tests for helper functions
+ *
+ * @return  embUnit tests
+ */
+Test *tests_crypto_helper_tests(void);
 /**
  * @brief   Generates tests for crypto/chacha.h
  *