diff --git a/tests/suites/test_suite_aes.function b/tests/suites/test_suite_aes.function
index fc2cbacc3..c45a9ed6f 100644
--- a/tests/suites/test_suite_aes.function
+++ b/tests/suites/test_suite_aes.function
@@ -303,7 +303,7 @@ void aes_encrypt_ofb( int fragment_size, char *hex_key_string,
     size_t iv_offset = 0;
     int in_buffer_len;
     unsigned char* src_str_next;
-    int key_len, iv_len;
+    int key_len;
 
     memset(key_str, 0x00, 100);
     memset(iv_str, 0x00, 100);
@@ -313,7 +313,7 @@ void aes_encrypt_ofb( int fragment_size, char *hex_key_string,
     mbedtls_aes_init( &ctx );
 
     key_len = unhexify( key_str, hex_key_string );
-    iv_len = unhexify( iv_str, hex_iv_string );
+    unhexify( iv_str, hex_iv_string );
     in_buffer_len = unhexify( src_str, hex_src_string );
 
     TEST_ASSERT( mbedtls_aes_setkey_enc( &ctx, key_str, key_len * 8 ) == 0 );