diff --git a/src/libutil/args.cc b/src/libutil/args.cc
index a981ed9fb..834fc7314 100644
--- a/src/libutil/args.cc
+++ b/src/libutil/args.cc
@@ -285,7 +285,7 @@ void RootArgs::parseCmdline(const Strings & _cmdline, bool allowShebang)
 
                 std::string line;
                 std::getline(stream,line);
-                static const std::string commentChars("#/\\%@*-");
+                static const std::string commentChars("#/\\%@*-(");
                 std::string shebangContent;
                 while (std::getline(stream,line) && !line.empty() && commentChars.find(line[0]) != std::string::npos){
                     line = chomp(line);