diff --git a/crypto/fipsmodule/bcm.c b/crypto/fipsmodule/bcm.c
index 6b21f06..e15ecb8 100644
--- a/crypto/fipsmodule/bcm.c
+++ b/crypto/fipsmodule/bcm.c
@@ -124,6 +124,7 @@
   if (!HMAC(EVP_sha512(), kHMACKey, sizeof(kHMACKey), start, end - start,
             result, &result_len) ||
       result_len != sizeof(result)) {
+    fprintf(stderr, "HMAC failed.\n");
     goto err;
   }
 
diff --git a/crypto/fipsmodule/self_check/self_check.c b/crypto/fipsmodule/self_check/self_check.c
index 2c5b363..1bbefa9 100644
--- a/crypto/fipsmodule/self_check/self_check.c
+++ b/crypto/fipsmodule/self_check/self_check.c
@@ -394,6 +394,7 @@
   // AES-CBC Encryption KAT
   memcpy(aes_iv, kAESIV, sizeof(kAESIV));
   if (AES_set_encrypt_key(kAESKey, 8 * sizeof(kAESKey), &aes_key) != 0) {
+    fprintf(stderr, "AES_set_encrypt_key failed.\n");
     goto err;
   }
   AES_cbc_encrypt(kPlaintext, output, sizeof(kPlaintext), &aes_key, aes_iv,
@@ -406,6 +407,7 @@
   // AES-CBC Decryption KAT
   memcpy(aes_iv, kAESIV, sizeof(kAESIV));
   if (AES_set_decrypt_key(kAESKey, 8 * sizeof(kAESKey), &aes_key) != 0) {
+    fprintf(stderr, "AES_set_decrypt_key failed.\n");
     goto err;
   }
   AES_cbc_encrypt(kAESCBCCiphertext, output, sizeof(kAESCBCCiphertext),
@@ -420,6 +422,7 @@
   OPENSSL_memset(nonce, 0, sizeof(nonce));
   if (!EVP_AEAD_CTX_init(&aead_ctx, EVP_aead_aes_128_gcm(), kAESKey,
                          sizeof(kAESKey), 0, NULL)) {
+    fprintf(stderr, "EVP_AEAD_CTX_init for AES-128-GCM failed.\n");
     goto err;
   }
 
@@ -429,6 +432,7 @@
                          kPlaintext, sizeof(kPlaintext), NULL, 0) ||
       !check_test(kAESGCMCiphertext, output, sizeof(kAESGCMCiphertext),
                   "AES-GCM Encryption KAT")) {
+    fprintf(stderr, "EVP_AEAD_CTX_seal for AES-128-GCM failed.\n");
     goto err;
   }
 
@@ -439,6 +443,7 @@
                          0) ||
       !check_test(kPlaintext, output, sizeof(kPlaintext),
                   "AES-GCM Decryption KAT")) {
+    fprintf(stderr, "EVP_AEAD_CTX_open for AES-128-GCM failed.\n");
     goto err;
   }
 
@@ -504,6 +509,7 @@
                 &sig_len, rsa_key) ||
       !check_test(kRSASignature, output, sizeof(kRSASignature),
                   "RSA Sign KAT")) {
+    fprintf(stderr, "RSA signing test failed.\n");
     goto err;
   }
 
@@ -558,6 +564,7 @@
                          sizeof(kDRBGAD)) ||
       !check_test(kDRBGReseedOutput, output, sizeof(kDRBGReseedOutput),
                   "DRBG Reseed KAT")) {
+    fprintf(stderr, "CTR-DRBG failed.\n");
     goto err;
   }
   CTR_DRBG_clear(&drbg);