diff --git a/include/mcc/mcc_keyvalue.h b/include/mcc/mcc_keyvalue.h
index 418f7b5..036ff9a 100644
--- a/include/mcc/mcc_keyvalue.h
+++ b/include/mcc/mcc_keyvalue.h
@@ -107,9 +107,10 @@ template <typename T>
 concept mcc_keyvalue_desc_c = requires(T t) { []<mcc_keyvalue_record_c... Ts>(std::tuple<Ts...>) {}(t); };
 
 
-static constexpr char MCC_KV_COMMENT_SEQ_ARR[] = "#";
-static constexpr char MCC_KV_KEY_VALUE_DELIM_SEQ_ARR[] = "=";
-static constexpr char MCC_KV_COMPOSITE_VALUE_DELIM_SEQ_ARR[] = ",";
+// use of 'inline' here to avoid '-Wsubobject-linkage' GCC-warning
+inline constexpr char MCC_KV_COMMENT_SEQ_ARR[] = "#";
+inline constexpr char MCC_KV_KEY_VALUE_DELIM_SEQ_ARR[] = "=";
+inline constexpr char MCC_KV_COMPOSITE_VALUE_DELIM_SEQ_ARR[] = ",";
 
 
 template <mcc_keyvalue_desc_c DESCR_T,