diff --git a/m-core.h b/m-core.h
index 38ad3bb7..1a6d1aca 100644
--- a/m-core.h
+++ b/m-core.h
@@ -2103,7 +2103,7 @@ namespace m_lib {
    NOTE: C++ definition using template as C++ doesn't support compound litteral.
 */
 #define M_CSTR(...)                                                           \
-  (const m_lib::m_char_array<M_USE_CSTR_ALLOC>(__VA_ARGS__)).m_get()
+  (m_lib::m_char_array<M_USE_CSTR_ALLOC>(__VA_ARGS__)).m_get()
 
 #else