diff --git a/tests/psa-client-server/psasim/src/psa_sim_generate.pl b/tests/psa-client-server/psasim/src/psa_sim_generate.pl
index e0e9b19f0..fbceddf8d 100755
--- a/tests/psa-client-server/psasim/src/psa_sim_generate.pl
+++ b/tests/psa-client-server/psasim/src/psa_sim_generate.pl
@@ -302,6 +302,10 @@ sub server_implementations_header
 #if !defined(MBEDTLS_PSA_CRYPTO_C)
 #error "Error: MBEDTLS_PSA_CRYPTO_C must be enabled on server build"
 #endif
+
+#if defined(MBEDTLS_TEST_HOOKS)
+void (*mbedtls_test_hook_error_add)(int, int, const char *, int);
+#endif
 EOF
 }