diff --git a/scripts/data_files/error.fmt b/scripts/data_files/error.fmt
index fd72f8b..1c8a790 100644
--- a/scripts/data_files/error.fmt
+++ b/scripts/data_files/error.fmt
@@ -19,7 +19,7 @@
 
 #include "common.h"
 
-#if defined(MBEDTLS_ERROR_STRERROR_DUMMY)
+#if defined(MBEDTLS_ERROR_C)
 #include <string.h>
 #endif