diff --git a/tests/suites/test_suite_x509write.function b/tests/suites/test_suite_x509write.function
index 1393103..c2d4e4e 100644
--- a/tests/suites/test_suite_x509write.function
+++ b/tests/suites/test_suite_x509write.function
@@ -169,7 +169,7 @@
     pk_init( &key );
     TEST_ASSERT( x509parse_keyfile( &key, key_file, NULL ) == 0 );
 
-    ret = x509write_key_pem( pk_rsa( key ), buf, sizeof( buf ) - 1);
+    ret = x509write_key_pem( &key, buf, sizeof( buf ) - 1);
     TEST_ASSERT( ret >= 0 );
 
     f = fopen( key_file, "r" );