diff --git a/include/wups/config/WUPSConfigCategory.h b/include/wups/config/WUPSConfigCategory.h
index ad5570e..797ddb3 100644
--- a/include/wups/config/WUPSConfigCategory.h
+++ b/include/wups/config/WUPSConfigCategory.h
@@ -1,6 +1,6 @@
 #pragma once
 
-#ifdef __cplusplus
+#if defined(__cplusplus) && __cplusplus >= 201703L
 
 #include "WUPSConfigItem.h"
 #include <optional>
diff --git a/include/wups/storage.h b/include/wups/storage.h
index 94ba791..69fc79f 100644
--- a/include/wups/storage.h
+++ b/include/wups/storage.h
@@ -647,7 +647,7 @@ WUPSStorageError WUPSStorageAPI_GetItemSize(wups_storage_item parent, const char
 }
 #endif
 
-#ifdef __cplusplus
+#if defined(__cplusplus) && __cplusplus >= 201703L
 
 #include <cstring>
 #include <memory>