diff --git a/pwndbg/commands/mprotect.py b/pwndbg/commands/mprotect.py
index 3f91b1abf..de631c813 100644
--- a/pwndbg/commands/mprotect.py
+++ b/pwndbg/commands/mprotect.py
@@ -47,7 +47,7 @@ def prot_str_to_val(protstr):
 @pwndbg.commands.ArgparsedCommand(parser)
 @pwndbg.commands.OnlyWhenRunning
 @pwndbg.commands.OnlyAmd64
-def mprotect(addr, length, prot: str):
+def mprotect(addr, length, prot):
     '''Only x86_64.'''
     saved_rax = pwndbg.regs.rax
     saved_rbx = pwndbg.regs.rbx