diff --git a/tests/suites/test_suite_constant_time.function b/tests/suites/test_suite_constant_time.function
index a8ba575..0e2cfdc 100644
--- a/tests/suites/test_suite_constant_time.function
+++ b/tests/suites/test_suite_constant_time.function
@@ -136,6 +136,7 @@
 #endif
 
     TEST_EQUAL(mbedtls_ct_uint_if_else_0(c, t), (unsigned) expected0);
+    TEST_EQUAL(mbedtls_ct_size_if_else_0(c, (size_t) t), (size_t) expected0);
 #if defined(MBEDTLS_BIGNUM_C)
     TEST_EQUAL(mbedtls_ct_mpi_uint_if_else_0(c, t), (mbedtls_mpi_uint) expected0);
 #endif