diff --git a/grammar.js b/grammar.js
index a50f3ea..bc70d61 100644
--- a/grammar.js
+++ b/grammar.js
@@ -51,7 +51,7 @@ const PREC = {
 };
 const DEC_DIGITS = token(sep1(/[0-9]+/, /_+/));
 const HEX_DIGITS = token(sep1(/[0-9a-fA-F]+/, /_+/));
-const BIN_DIGITS = token(sep1(/[01]/, /_+/));
+const BIN_DIGITS = token(sep1(/[01]+/, /_+/));
 const REAL_EXPONENT = token(seq(/[eE]/, optional(/[+-]/), DEC_DIGITS));
 
 module.exports = grammar({
diff --git a/src/grammar.json b/src/grammar.json
index b70fff3..1eab122 100644
--- a/src/grammar.json
+++ b/src/grammar.json
@@ -6130,7 +6130,7 @@
               "members": [
                 {
                   "type": "PATTERN",
-                  "value": "[01]"
+                  "value": "[01]+"
                 },
                 {
                   "type": "REPEAT",
@@ -6143,7 +6143,7 @@
                       },
                       {
                         "type": "PATTERN",
-                        "value": "[01]"
+                        "value": "[01]+"
                       }
                     ]
                   }
diff --git a/src/parser.c b/src/parser.c
index 7f7fea1..3b18f7b 100644
--- a/src/parser.c
+++ b/src/parser.c
@@ -19332,6 +19332,8 @@ static bool ts_lex(TSLexer *lexer, TSStateId state) {
     case 519:
       ACCEPT_TOKEN(sym_bin_literal);
       if (lookahead == '_') ADVANCE(172);
+      if (lookahead == '0' ||
+          lookahead == '1') ADVANCE(519);
       END_STATE();
     case 520:
       ACCEPT_TOKEN(anon_sym_SQUOTE);