diff --git a/scripts/data_files/error.fmt b/scripts/data_files/error.fmt
index 781e72a..b75a9ab 100644
--- a/scripts/data_files/error.fmt
+++ b/scripts/data_files/error.fmt
@@ -152,8 +152,4 @@
 
 #endif /* MBEDTLS_ERROR_C */
 
-#if defined(MBEDTLS_TEST_HOOKS)
-void (*mbedtls_test_hook_error_add)(int, int, const char *, int);
-#endif
-
 #endif /* MBEDTLS_ERROR_C || MBEDTLS_ERROR_STRERROR_DUMMY */