diff --git a/tests/suites/test_suite_pem.function b/tests/suites/test_suite_pem.function
index b3b3e8d28..413dc551c 100644
--- a/tests/suites/test_suite_pem.function
+++ b/tests/suites/test_suite_pem.function
@@ -41,21 +41,21 @@ void mbedtls_pem_write_buffer_lengths()
     int ret;
     for (size_t l = 0; l <= sizeof(data); l++) {
         ret = mbedtls_pem_write_buffer("\n", "\n", data, l, NULL, 0, &olen_needed);
-        TEST_ASSERT(ret == MBEDTLS_ERR_BASE64_BUFFER_TOO_SMALL);
+        TEST_EQUAL(ret, MBEDTLS_ERR_BASE64_BUFFER_TOO_SMALL);
 
         /* Test that a bigger buffer still only requires `olen_needed` */
         ret = mbedtls_pem_write_buffer("\n", "\n", data, l, buf, sizeof(buf), &olen);
-        TEST_ASSERT(ret == 0);
-        TEST_ASSERT(olen_needed == olen);
+        TEST_EQUAL(ret, 0);
+        TEST_EQUAL(olen_needed, olen);
 
         /* Test that a buffer of exactly `olen_needed` works */
         memset(buf, 1, sizeof(buf));
         ret = mbedtls_pem_write_buffer("\n", "\n", data, l, buf, olen_needed, &olen);
-        TEST_ASSERT(ret == 0);
-        TEST_ASSERT(olen_needed == olen);
+        TEST_EQUAL(ret, 0);
+        TEST_EQUAL(olen_needed, olen);
         /* Test the function didn't overflow the given buffer */
         for (size_t i = olen_needed; i < sizeof(buf); i++) {
-            TEST_ASSERT(buf[i] == 1);
+            TEST_EQUAL(buf[i], 1);
         }
     }
 }