diff --git a/README.md b/README.md
index b890733..b7a6d58 100644
--- a/README.md
+++ b/README.md
@@ -1170,6 +1170,8 @@ I appreciate the help of the contributors who introduced the great feature to th
   - Fixed warnings on MSVC
 - Ivan Shynkarenka (@chronoxor)
   - Fixed Visual Studio 2019 warnings
+- @khoitd1997
+  - Fixed warnings while type conversion
 
 ## Licensing terms
 
diff --git a/toml/combinator.hpp b/toml/combinator.hpp
index 9f9fa9c..1c6ce25 100644
--- a/toml/combinator.hpp
+++ b/toml/combinator.hpp
@@ -45,7 +45,7 @@ inline std::string show_char(const char c)
         buf.fill('\0');
         const auto r = std::snprintf(
                 buf.data(), buf.size(), "0x%02x", static_cast<int>(c) & 0xFF);
-        assert(r == buf.size() - 1);
+        assert(r == static_cast<int>(buf.size()) - 1);
         return std::string(buf.data());
     }
 }
diff --git a/toml/get.hpp b/toml/get.hpp
index 40f4a93..bbc9a09 100644
--- a/toml/get.hpp
+++ b/toml/get.hpp
@@ -713,7 +713,7 @@ get_or(basic_value<C, M, V>&& v, T&& opt)
     }
     catch(...)
     {
-        return std::string(opt);
+        return std::forward<T>(opt);
     }
 }
 
@@ -829,10 +829,10 @@ template<typename T, typename C,
 detail::enable_if_t<std::is_same<T, std::string>::value, std::string>
 find_or(basic_value<C, M, V>&& v, const toml::key& ky, T&& opt)
 {
-    if(!v.is_table()) {return opt;}
-    auto tab = std::move(v).as_table();
-    if(tab.count(ky) == 0) {return opt;}
-    return get_or(std::move(tab.at(ky)), std::forward<T>(opt));
+    if(!v.is_table()) {return std::forward<T>(opt);}
+    auto tab = toml::get<toml::table>(std::move(v));
+    if(tab.count(ky) == 0) {return std::forward<T>(opt);}
+    return get_or(std::move(tab[ky]), std::forward<T>(opt));
 }
 
 // ---------------------------------------------------------------------------
@@ -934,7 +934,7 @@ detail::enable_if_t<detail::conjunction<
     >::value, std::string>
 find_or(Table&& tab, const key& ky, T&& opt)
 {
-    if(tab.count(ky) == 0) {return opt;}
+    if(tab.count(ky) == 0) {return std::forward<T>(opt);}
     return get_or(std::move(tab[ky]), std::forward<T>(opt));
 }