diff --git a/AK/ArgsParser.cpp b/AK/ArgsParser.cpp
index d98fffcea3..0e2b629775 100644
--- a/AK/ArgsParser.cpp
+++ b/AK/ArgsParser.cpp
@@ -28,8 +28,8 @@ ArgsParser::Arg::Arg(const String& name, const String& value_name, const String&
     : name(name), description(description), value_name(value_name), required(required)
 {}
 
-ArgsParser::ArgsParser(const String& program_name, const String& prefix)
-    : m_program_name(program_name), m_prefix(prefix)
+ArgsParser::ArgsParser(const String& program_name)
+    : m_program_name(program_name), m_prefix("-")
 {}
 
 ArgsParserResult ArgsParser::parse(const int argc, const char** argv) 
diff --git a/AK/ArgsParser.h b/AK/ArgsParser.h
index 856e1ed976..8879b127bc 100644
--- a/AK/ArgsParser.h
+++ b/AK/ArgsParser.h
@@ -30,7 +30,7 @@ private:
 
 class ArgsParser {
 public:
-    ArgsParser(const String& program_name, const String& prefix);
+    ArgsParser(const String& program_name);
 
     ArgsParserResult parse(const int argc, const char** argv);
 
diff --git a/Userland/pidof.cpp b/Userland/pidof.cpp
index a0909cb88d..1a749abf88 100644
--- a/Userland/pidof.cpp
+++ b/Userland/pidof.cpp
@@ -34,7 +34,7 @@ static int pid_of(const String& process_name, bool single_shot, bool omit_pid, p
 
 int main(int argc, char** argv)
 {
-    AK::ArgsParser args_parser("pidof", "-");
+    AK::ArgsParser args_parser("pidof");
 
     args_parser.add_arg("s", "Single shot - this instructs the program to only return one pid");
     args_parser.add_arg("o", "pid", "Tells pidof to omit processes with that pid. The special pid %PPID can be used to name the parent process of the pidof program.");