diff --git a/sys/tools/makesyscalls.lua b/sys/tools/makesyscalls.lua
index 8bb763d65da..566ce5bafc5 100644
--- a/sys/tools/makesyscalls.lua
+++ b/sys/tools/makesyscalls.lua
@@ -1010,6 +1010,7 @@ process_syscall_def = function(line)
 			abort(1, "Not a signature? " .. line)
 		end
 		args = line:match("^[^(]+%((.+)%)[^)]*$")
+		args = trim(args, '[,%s]')
 	end
 
 	::skipalt::