diff --git a/lib/Guacamole.pm b/lib/Guacamole.pm
index ea11891..c4b84de 100644
--- a/lib/Guacamole.pm
+++ b/lib/Guacamole.pm
@@ -1125,7 +1125,9 @@ OpKeywordReadExpr             ::= OpKeywordRead OpListKeywordArg
 
 OpKeywordReaddirExpr          ::= OpKeywordReaddir OpUnaryKeywordArg
 
-OpKeywordReadlineExpr         ::= OpKeywordReadline OpUnaryKeywordArg
+OpKeywordReadlineExpr         ::= OpKeywordReadline LParen BuiltinFilehandle RParen
+                                | OpKeywordReadline BuiltinFilehandle
+                                | OpKeywordReadline OpUnaryKeywordArg
                                 | OpKeywordReadline
 
 OpKeywordReadlinkExpr         ::= OpKeywordReadlink OpUnaryKeywordArg
diff --git a/t/Statements/Expressions/OpUnaryKeywordExpr/OpKeywordReadlineExpr.t b/t/Statements/Expressions/OpUnaryKeywordExpr/OpKeywordReadlineExpr.t
new file mode 100644
index 0000000..4b525ec
--- /dev/null
+++ b/t/Statements/Expressions/OpUnaryKeywordExpr/OpKeywordReadlineExpr.t
@@ -0,0 +1,11 @@
+use strict;
+use warnings;
+use Guacamole::Test;
+
+parses('readline;');
+parses('readline();');
+parses('readline STDIN;');
+parses('readline (STDIN);');
+parses('readline(STDIN);');
+
+done_testing();