diff --git a/source/argparse/internal/command.d b/source/argparse/internal/command.d
index 698a1c1..1adcacb 100644
--- a/source/argparse/internal/command.d
+++ b/source/argparse/internal/command.d
@@ -291,6 +291,9 @@ package(argparse) Command createCommand(Config config, COMMAND_TYPE, CommandInfo
 
         static if(pos < positionalArgs.length - 1)
             static assert(info.minValuesCount.get == info.maxValuesCount.get, "Positional argument with index "~pos.stringof~" in "~COMMAND_TYPE.stringof~" has variable number of values.");
+
+        static if(i > 0 && info.required)
+            static assert(positionalArgs[i-1].required, "Required positional argument with index "~pos.stringof~" comes after optional positional argument");
     }}
 
     static foreach(info; argumentInfos)