diff --git a/setup.py b/setup.py
index 87f4dbee0..de25e0ef9 100755
--- a/setup.py
+++ b/setup.py
@@ -68,7 +68,6 @@ def build_tables():
     from xonsh.parser import Parser
 
     Parser(
-        lexer_table="lexer_table",
         yacc_table="parser_table",
         outputdir=os.path.join(root_dir, "xonsh"),
         yacc_debug=True,
diff --git a/tests/test_parser.py b/tests/test_parser.py
index 2ffbd603f..a60fadb21 100644
--- a/tests/test_parser.py
+++ b/tests/test_parser.py
@@ -19,7 +19,7 @@ def xonsh_builtins_autouse(xonsh_builtins):
     return xonsh_builtins
 
 
-PARSER = Parser(lexer_optimize=False, yacc_optimize=False, yacc_debug=True)
+PARSER = Parser(yacc_optimize=False, yacc_debug=True)
 
 
 def check_ast(inp, run=True, mode="eval", debug_level=0):
diff --git a/xonsh/parsers/base.py b/xonsh/parsers/base.py
index ee71be563..528fbaf45 100644
--- a/xonsh/parsers/base.py
+++ b/xonsh/parsers/base.py
@@ -257,8 +257,6 @@ class BaseParser(object):
 
     def __init__(
         self,
-        lexer_optimize=True,
-        lexer_table="xonsh.lexer_table",
         yacc_optimize=True,
         yacc_table="xonsh.parser_table",
         yacc_debug=False,
@@ -266,10 +264,6 @@ class BaseParser(object):
     ):
         """Parameters
         ----------
-        lexer_optimize : bool, optional
-            Set to false when unstable and true when lexer is stable.
-        lexer_table : str, optional
-            Lexer module used when optimized.
         yacc_optimize : bool, optional
             Set to false when unstable and true when parser is stable.
         yacc_table : str, optional
diff --git a/xonsh/parsers/v36.py b/xonsh/parsers/v36.py
index ae2853ba8..44f4ec19b 100644
--- a/xonsh/parsers/v36.py
+++ b/xonsh/parsers/v36.py
@@ -9,8 +9,6 @@ class Parser(BaseParser):
 
     def __init__(
         self,
-        lexer_optimize=True,
-        lexer_table="xonsh.lexer_table",
         yacc_optimize=True,
         yacc_table="xonsh.parser_table",
         yacc_debug=False,
@@ -19,10 +17,6 @@ class Parser(BaseParser):
         """
         Parameters
         ----------
-        lexer_optimize : bool, optional
-            Set to false when unstable and true when lexer is stable.
-        lexer_table : str, optional
-            Lexer module used when optimized.
         yacc_optimize : bool, optional
             Set to false when unstable and true when parser is stable.
         yacc_table : str, optional
@@ -37,8 +31,6 @@ class Parser(BaseParser):
         for rule in tok_rules:
             self._tok_rule(rule)
         super().__init__(
-            lexer_optimize=lexer_optimize,
-            lexer_table=lexer_table,
             yacc_optimize=yacc_optimize,
             yacc_table=yacc_table,
             yacc_debug=yacc_debug,
diff --git a/xonsh/parsers/v38.py b/xonsh/parsers/v38.py
index 6b7a18239..f022dd0f5 100644
--- a/xonsh/parsers/v38.py
+++ b/xonsh/parsers/v38.py
@@ -10,8 +10,6 @@ class Parser(ThreeSixParser):
 
     def __init__(
         self,
-        lexer_optimize=True,
-        lexer_table="xonsh.lexer_table",
         yacc_optimize=True,
         yacc_table="xonsh.parser_table",
         yacc_debug=False,
@@ -19,10 +17,6 @@ class Parser(ThreeSixParser):
     ):
         """Parameters
         ----------
-        lexer_optimize : bool, optional
-            Set to false when unstable and true when lexer is stable.
-        lexer_table : str, optional
-            Lexer module used when optimized.
         yacc_optimize : bool, optional
             Set to false when unstable and true when parser is stable.
         yacc_table : str, optional
@@ -43,8 +37,6 @@ class Parser(ThreeSixParser):
         for rule in tok_rules:
             self._tok_rule(rule)
         super().__init__(
-            lexer_optimize=lexer_optimize,
-            lexer_table=lexer_table,
             yacc_optimize=yacc_optimize,
             yacc_table=yacc_table,
             yacc_debug=yacc_debug,