diff --git a/tests/src/psa_exercise_key.c b/tests/src/psa_exercise_key.c
index 1ef2622..7f93496 100644
--- a/tests/src/psa_exercise_key.c
+++ b/tests/src/psa_exercise_key.c
@@ -748,14 +748,14 @@
                                         MBEDTLS_ASN1_SEQUENCE |
                                         MBEDTLS_ASN1_CONSTRUCTED),
                    0);
-        TEST_EQUAL(len, (uintptr_t) end - (uintptr_t) p);
+        TEST_EQUAL(len, end - p);
         if (!mbedtls_test_asn1_skip_integer(&p, end, bits, bits, 1)) {
             goto exit;
         }
         if (!mbedtls_test_asn1_skip_integer(&p, end, 2, bits, 1)) {
             goto exit;
         }
-        TEST_EQUAL((uintptr_t) p - (uintptr_t) end, 0);
+        TEST_EQUAL(p - end, 0);
 
 
         TEST_ASSERT(exported_length <=