diff --git a/scripts/data_files/error.fmt b/scripts/data_files/error.fmt
index 3be94bd..c2b4b08 100644
--- a/scripts/data_files/error.fmt
+++ b/scripts/data_files/error.fmt
@@ -164,6 +164,7 @@
 
 #if defined(MBEDTLS_TEST_HOOKS)
 void (*mbedtls_test_hook_error_add)( int, int, const char *, int );
+void (*mbedtls_test_hook_value)( int, const char *, int );
 #endif
 
 #endif /* MBEDTLS_ERROR_C || MBEDTLS_ERROR_STRERROR_DUMMY */