diff --git a/tests/data_files/Makefile b/tests/data_files/Makefile
index f906545..3bd2c35 100644
--- a/tests/data_files/Makefile
+++ b/tests/data_files/Makefile
@@ -114,7 +114,7 @@
 all_final += server1.v1.crt server1.v1.der
 
 # OpenSSL-generated certificates for comparison
-# Also provide certificates to DER format to allow
+# Also provide certificates in DER format to allow
 # direct binary comparison using e.g. dumpasn1
 server1.crt.openssl server1.key_usage.crt.openssl server1.cert_type.crt.openssl: server1.key server1.csr $(test_ca_crt) $(test_ca_key_file_rsa) $(test_ca_server1_config_file)
 	echo "01" > $(test_ca_server1_serial)
diff --git a/tests/suites/test_suite_x509write.function b/tests/suites/test_suite_x509write.function
index 0b6e602..ca76e86 100644
--- a/tests/suites/test_suite_x509write.function
+++ b/tests/suites/test_suite_x509write.function
@@ -63,7 +63,7 @@
     if( cert_type != 0 )
         TEST_ASSERT( mbedtls_x509write_csr_set_ns_cert_type( &req, cert_type ) == 0 );
 
-    ret = mbedtls_x509write_csr_pem( &req, buf, sizeof(buf),
+    ret = mbedtls_x509write_csr_pem( &req, buf, sizeof( buf ),
                              rnd_pseudo_rand, &rnd_info );
     TEST_ASSERT( ret == 0 );
 
@@ -149,7 +149,7 @@
 
     TEST_ASSERT( mbedtls_x509write_crt_set_serial( &crt, &serial ) == 0 );
     TEST_ASSERT( mbedtls_x509write_crt_set_validity( &crt, not_before,
-                                                   not_after ) == 0 );
+                                                     not_after ) == 0 );
     mbedtls_x509write_crt_set_md_alg( &crt, md_type );
     TEST_ASSERT( mbedtls_x509write_crt_set_issuer_name( &crt, issuer_name ) == 0 );
     TEST_ASSERT( mbedtls_x509write_crt_set_subject_name( &crt, subject_name ) == 0 );
@@ -169,30 +169,30 @@
             TEST_ASSERT( mbedtls_x509write_crt_set_ns_cert_type( &crt, cert_type ) == 0 );
     }
 
-    ret = mbedtls_x509write_crt_pem( &crt, buf, sizeof(buf),
-                             rnd_pseudo_rand, &rnd_info );
+    ret = mbedtls_x509write_crt_pem( &crt, buf, sizeof( buf ),
+                                     rnd_pseudo_rand, &rnd_info );
     TEST_ASSERT( ret == 0 );
 
     pem_len = strlen( (char *) buf );
 
     f = fopen( cert_check_file, "r" );
     TEST_ASSERT( f != NULL );
-    olen = fread( check_buf, 1, sizeof(check_buf), f );
+    olen = fread( check_buf, 1, sizeof( check_buf ), f );
     fclose( f );
-    TEST_ASSERT( olen < sizeof(check_buf) );
+    TEST_ASSERT( olen < sizeof( check_buf ) );
 
     TEST_ASSERT( olen >= pem_len - 1 );
     TEST_ASSERT( memcmp( buf, check_buf, pem_len - 1 ) == 0 );
 
     der_len = mbedtls_x509write_crt_der( &crt, buf, sizeof( buf ),
-                            rnd_pseudo_rand, &rnd_info );
+                                         rnd_pseudo_rand, &rnd_info );
     TEST_ASSERT( der_len >= 0 );
 
     if( der_len == 0 )
         goto exit;
 
     ret = mbedtls_x509write_crt_der( &crt, buf, (size_t)( der_len - 1 ),
-                            rnd_pseudo_rand, &rnd_info );
+                                     rnd_pseudo_rand, &rnd_info );
     TEST_ASSERT( ret == MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
 
 exit: