diff --git a/tests/suites/test_suite_mpi.function b/tests/suites/test_suite_mpi.function
index d6769de..4f5b69d 100644
--- a/tests/suites/test_suite_mpi.function
+++ b/tests/suites/test_suite_mpi.function
@@ -866,7 +866,7 @@
     TEST_CF_SECRET( X, len_X * sizeof( mbedtls_mpi_uint ) );
     TEST_CF_SECRET( Y, len_Y * sizeof( mbedtls_mpi_uint ) );
 
-    mbedtls_mpi_core_cond_swap( X, len_X, Y, len_Y, cond );
+    mbedtls_mpi_core_cond_swap( X, Y, len_X, cond );
 
     TEST_CF_PUBLIC( X, len_X * sizeof( mbedtls_mpi_uint ) );
     TEST_CF_PUBLIC( Y, len_Y * sizeof( mbedtls_mpi_uint ) );