diff --git a/tests/include/test/helpers.h b/tests/include/test/helpers.h
index 134e49b..ad6b9d7 100644
--- a/tests/include/test/helpers.h
+++ b/tests/include/test/helpers.h
@@ -77,7 +77,7 @@
  *
  * For convenience, dies if allocation fails.
  */
-unsigned char *unhexify_alloc( const char *ibuf, size_t *olen );
+unsigned char *mbedtls_test_unhexify_alloc( const char *ibuf, size_t *olen );
 
 int hexcmp( uint8_t * a, uint8_t * b, uint32_t a_len, uint32_t b_len );
 
diff --git a/tests/src/helpers.c b/tests/src/helpers.c
index 063ebcd..5f12501 100644
--- a/tests/src/helpers.c
+++ b/tests/src/helpers.c
@@ -113,7 +113,7 @@
     return( p );
 }
 
-unsigned char *unhexify_alloc( const char *ibuf, size_t *olen )
+unsigned char *mbedtls_test_unhexify_alloc( const char *ibuf, size_t *olen )
 {
     unsigned char *obuf;
 
diff --git a/tests/suites/test_suite_aes.function b/tests/suites/test_suite_aes.function
index 8fe0bda..887cee8 100644
--- a/tests/suites/test_suite_aes.function
+++ b/tests/suites/test_suite_aes.function
@@ -119,14 +119,14 @@
 
     mbedtls_aes_xts_init( &ctx );
 
-    data_unit = unhexify_alloc( hex_data_unit_string, &data_unit_len );
+    data_unit = mbedtls_test_unhexify_alloc( hex_data_unit_string, &data_unit_len );
     TEST_ASSERT( data_unit_len == AES_BLOCK_SIZE );
 
-    key = unhexify_alloc( hex_key_string, &key_len );
+    key = mbedtls_test_unhexify_alloc( hex_key_string, &key_len );
     TEST_ASSERT( key_len % 2 == 0 );
 
-    src = unhexify_alloc( hex_src_string, &src_len );
-    dst = unhexify_alloc( hex_dst_string, &dst_len );
+    src = mbedtls_test_unhexify_alloc( hex_src_string, &src_len );
+    dst = mbedtls_test_unhexify_alloc( hex_dst_string, &dst_len );
     TEST_ASSERT( src_len == dst_len );
 
     output = mbedtls_test_zero_alloc( dst_len );
@@ -162,14 +162,14 @@
 
     mbedtls_aes_xts_init( &ctx );
 
-    data_unit = unhexify_alloc( hex_data_unit_string, &data_unit_len );
+    data_unit = mbedtls_test_unhexify_alloc( hex_data_unit_string, &data_unit_len );
     TEST_ASSERT( data_unit_len == AES_BLOCK_SIZE );
 
-    key = unhexify_alloc( hex_key_string, &key_len );
+    key = mbedtls_test_unhexify_alloc( hex_key_string, &key_len );
     TEST_ASSERT( key_len % 2 == 0 );
 
-    src = unhexify_alloc( hex_src_string, &src_len );
-    dst = unhexify_alloc( hex_dst_string, &dst_len );
+    src = mbedtls_test_unhexify_alloc( hex_src_string, &src_len );
+    dst = mbedtls_test_unhexify_alloc( hex_dst_string, &dst_len );
     TEST_ASSERT( src_len == dst_len );
 
     output = mbedtls_test_zero_alloc( dst_len );
diff --git a/tests/suites/test_suite_hkdf.function b/tests/suites/test_suite_hkdf.function
index 9781e7f..47e8ee6 100644
--- a/tests/suites/test_suite_hkdf.function
+++ b/tests/suites/test_suite_hkdf.function
@@ -63,9 +63,9 @@
     output_prk_len = mbedtls_md_get_size( md );
     output_prk = mbedtls_calloc( 1, output_prk_len );
 
-    ikm = unhexify_alloc( hex_ikm_string, &ikm_len );
-    salt = unhexify_alloc( hex_salt_string, &salt_len );
-    prk = unhexify_alloc( hex_prk_string, &prk_len );
+    ikm = mbedtls_test_unhexify_alloc( hex_ikm_string, &ikm_len );
+    salt = mbedtls_test_unhexify_alloc( hex_salt_string, &salt_len );
+    prk = mbedtls_test_unhexify_alloc( hex_prk_string, &prk_len );
     TEST_ASSERT( prk_len == output_prk_len );
 
     ret = mbedtls_hkdf_extract( md, salt, salt_len, ikm, ikm_len, output_prk );
@@ -98,9 +98,9 @@
 
     output_okm = mbedtls_calloc( OKM_LEN, 1 );
 
-    prk = unhexify_alloc( hex_prk_string, &prk_len );
-    info = unhexify_alloc( hex_info_string, &info_len );
-    okm = unhexify_alloc( hex_okm_string, &okm_len );
+    prk = mbedtls_test_unhexify_alloc( hex_prk_string, &prk_len );
+    info = mbedtls_test_unhexify_alloc( hex_info_string, &info_len );
+    okm = mbedtls_test_unhexify_alloc( hex_okm_string, &okm_len );
     TEST_ASSERT( prk_len == mbedtls_md_get_size( md ) );
     TEST_ASSERT( okm_len < OKM_LEN );