diff --git a/efiXplorer/efi_defs.h b/efiXplorer/efi_defs.h
index 617e5269..9308c2d1 100644
--- a/efiXplorer/efi_defs.h
+++ b/efiXplorer/efi_defs.h
@@ -198,12 +198,12 @@ struct efi_guid_t {
   }
 
   std::string to_string() const {
-    char res[37] = {0};
-    snprintf(res, sizeof(res),
+    char guid_str[37] = {0};
+    snprintf(guid_str, sizeof(guid_str),
              "%08X-%04X-%04X-%02X%02X-%02X%02X%02X%02X%02X%02X", data1, data2,
              data3, data4[0], data4[1], data4[2], data4[3], data4[4], data4[5],
              data4[6], data4[7]);
-    return res;
+    return guid_str;
   }
 };
 
diff --git a/efiXplorer/efi_utils.cc b/efiXplorer/efi_utils.cc
index 45e063bd..ae9f8772 100644
--- a/efiXplorer/efi_utils.cc
+++ b/efiXplorer/efi_utils.cc
@@ -649,7 +649,7 @@ bool efi_utils::check_install_protocol(ea_t ea) {
 //--------------------------------------------------------------------------
 // convert 64-bit value to hex string
 std::string efi_utils::as_hex(uint64_t value) {
-  char hexstr[21] = {};
+  char hexstr[21] = {0};
   snprintf(hexstr, sizeof(hexstr), "%" PRIX64, value);
   return hexstr;
 }