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;