diff --git a/tests/suites/test_suite_common.function b/tests/suites/test_suite_common.function
index 6c0d4afc4d..c8a7a52abc 100644
--- a/tests/suites/test_suite_common.function
+++ b/tests/suites/test_suite_common.function
@@ -74,9 +74,9 @@ void mbedtls_xor( int len )
         int r_off = i & 1, a_off = (i & 2) >> 1, b_off = (i & 4) >> 2;
         fill_arrays( a, b, r1, r2, n + 1 );
 
-        for ( size_t i = 0; i < n; i++ )
+        for ( size_t j = 0; j < n; j++ )
         {
-            r1[i + r_off] = a[i + a_off] ^ b[i + b_off];
+            r1[j + r_off] = a[j + a_off] ^ b[j + b_off];
         }
         mbedtls_xor( r2 + r_off, a + a_off, b + b_off, n );
         ASSERT_COMPARE( r1 + r_off, n, r2 + r_off, n );