diff --git a/src/RestSharp/Extensions/ReflectionExtensions.cs b/src/RestSharp/Extensions/ReflectionExtensions.cs
index 1cdf4db49..a5b2edb67 100644
--- a/src/RestSharp/Extensions/ReflectionExtensions.cs
+++ b/src/RestSharp/Extensions/ReflectionExtensions.cs
@@ -62,6 +62,8 @@ public static bool IsSubclassOfRawGeneric(this Type toCheck, Type generic)
             return false;
         }
 
+        internal static object ChangeType(this object source, Type newType, IFormatProvider provider) => Convert.ChangeType(source, newType, provider);
+        
         internal static object ChangeType(this object source, Type newType) => Convert.ChangeType(source, newType);
 
         /// <summary>
diff --git a/src/RestSharp/Serializers/Json/JsonSerializer.cs b/src/RestSharp/Serializers/Json/JsonSerializer.cs
index 258756df6..458a78fea 100644
--- a/src/RestSharp/Serializers/Json/JsonSerializer.cs
+++ b/src/RestSharp/Serializers/Json/JsonSerializer.cs
@@ -236,7 +236,7 @@ object ConvertValue(TypeInfo typeInfo, object value)
             }
 
             var type = typeInfo.AsType();
-            if (typeInfo.IsPrimitive) return value.ChangeType(type);
+            if (typeInfo.IsPrimitive) return value.ChangeType(type, Culture);
 
             if (typeInfo.IsEnum) return type.FindEnumValue(stringValue, Culture);