diff --git a/library/ccm.c b/library/ccm.c
index 8331f5d..0dd712a 100644
--- a/library/ccm.c
+++ b/library/ccm.c
@@ -423,23 +423,23 @@
 /*
  * The data is the same for all tests, only the used length changes
  */
-static const unsigned char key[] = {
+static const unsigned char key_test_data[] = {
     0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47,
     0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f
 };
 
-static const unsigned char iv[] = {
+static const unsigned char iv_test_data[] = {
     0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
     0x18, 0x19, 0x1a, 0x1b
 };
 
-static const unsigned char ad[] = {
+static const unsigned char ad_test_data[] = {
     0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
     0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
     0x10, 0x11, 0x12, 0x13
 };
 
-static const unsigned char msg[CCM_SELFTEST_PT_MAX_LEN] = {
+static const unsigned char msg_test_data[CCM_SELFTEST_PT_MAX_LEN] = {
     0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27,
     0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f,
     0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
@@ -450,7 +450,7 @@
 static const size_t msg_len_test_data[NB_TESTS] = { 4, 16, 24 };
 static const size_t tag_len_test_data[NB_TESTS] = { 4, 6,  8  };
 
-static const unsigned char res[NB_TESTS][CCM_SELFTEST_CT_MAX_LEN] = {
+static const unsigned char res_test_data[NB_TESTS][CCM_SELFTEST_CT_MAX_LEN] = {
     {   0x71, 0x62, 0x01, 0x5b, 0x4d, 0xac, 0x25, 0x5d },
     {   0xd2, 0xa1, 0xf0, 0xe0, 0x51, 0xea, 0x5f, 0x62,
         0x08, 0x1a, 0x77, 0x92, 0x07, 0x3d, 0x59, 0x3d,
@@ -476,7 +476,7 @@
 
     mbedtls_ccm_init( &ctx );
 
-    if( mbedtls_ccm_setkey( &ctx, MBEDTLS_CIPHER_ID_AES, key, 8 * sizeof key ) != 0 )
+    if( mbedtls_ccm_setkey( &ctx, MBEDTLS_CIPHER_ID_AES, key_test_data, 8 * sizeof key_test_data ) != 0 )
     {
         if( verbose != 0 )
             mbedtls_printf( "  CCM: setup failed" );
@@ -491,15 +491,16 @@
 
         memset( plaintext, 0, CCM_SELFTEST_PT_MAX_LEN );
         memset( ciphertext, 0, CCM_SELFTEST_CT_MAX_LEN );
-        memcpy( plaintext, msg, msg_len_test_data[i] );
+        memcpy( plaintext, msg_test_data, msg_len_test_data[i] );
 
         ret = mbedtls_ccm_encrypt_and_tag( &ctx, msg_len_test_data[i],
-                                           iv, iv_len_test_data[i], ad, add_len_test_data[i],
+                                           iv_test_data, iv_len_test_data[i],
+                                           ad_test_data, add_len_test_data[i],
                                            plaintext, ciphertext,
                                            ciphertext + msg_len_test_data[i], tag_len_test_data[i] );
 
         if( ret != 0 ||
-            memcmp( ciphertext, res[i], msg_len_test_data[i] + tag_len_test_data[i] ) != 0 )
+            memcmp( ciphertext, res_test_data[i], msg_len_test_data[i] + tag_len_test_data[i] ) != 0 )
         {
             if( verbose != 0 )
                 mbedtls_printf( "failed\n" );
@@ -509,12 +510,13 @@
         memset( plaintext, 0, CCM_SELFTEST_PT_MAX_LEN );
 
         ret = mbedtls_ccm_auth_decrypt( &ctx, msg_len_test_data[i],
-                                        iv, iv_len_test_data[i], ad, add_len_test_data[i],
+                                        iv_test_data, iv_len_test_data[i],
+                                        ad_test_data, add_len_test_data[i],
                                         ciphertext, plaintext,
                                         ciphertext + msg_len_test_data[i], tag_len_test_data[i] );
 
         if( ret != 0 ||
-            memcmp( plaintext, msg, msg_len_test_data[i] ) != 0 )
+            memcmp( plaintext, msg_test_data, msg_len_test_data[i] ) != 0 )
         {
             if( verbose != 0 )
                 mbedtls_printf( "failed\n" );