diff --git a/src/crypto/aes-cbc.c b/src/crypto/aes-cbc.c
index 2833cfcc8..0835f2cfb 100644
--- a/src/crypto/aes-cbc.c
+++ b/src/crypto/aes-cbc.c
@@ -28,6 +28,9 @@ int aes_128_cbc_encrypt(const u8 *key, const u8 *iv, u8 *data, size_t data_len)
 	u8 *pos = data;
 	int i, j, blocks;
 
+	if (TEST_FAIL())
+		return -1;
+
 	ctx = aes_encrypt_init(key, 16);
 	if (ctx == NULL)
 		return -1;
@@ -61,6 +64,9 @@ int aes_128_cbc_decrypt(const u8 *key, const u8 *iv, u8 *data, size_t data_len)
 	u8 *pos = data;
 	int i, j, blocks;
 
+	if (TEST_FAIL())
+		return -1;
+
 	ctx = aes_decrypt_init(key, 16);
 	if (ctx == NULL)
 		return -1;
diff --git a/src/crypto/crypto_openssl.c b/src/crypto/crypto_openssl.c
index 9e344d1de..ad2d2d4a2 100644
--- a/src/crypto/crypto_openssl.c
+++ b/src/crypto/crypto_openssl.c
@@ -345,6 +345,9 @@ int aes_128_cbc_encrypt(const u8 *key, const u8 *iv, u8 *data, size_t data_len)
 	int clen, len;
 	u8 buf[16];
 
+	if (TEST_FAIL())
+		return -1;
+
 	EVP_CIPHER_CTX_init(&ctx);
 	if (EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL, key, iv) != 1)
 		return -1;
@@ -370,6 +373,9 @@ int aes_128_cbc_decrypt(const u8 *key, const u8 *iv, u8 *data, size_t data_len)
 	int plen, len;
 	u8 buf[16];
 
+	if (TEST_FAIL())
+		return -1;
+
 	EVP_CIPHER_CTX_init(&ctx);
 	if (EVP_DecryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL, key, iv) != 1)
 		return -1;