diff --git a/lib/parse.js b/lib/parse.js
index 0b3b45cd..f3a585d1 100644
--- a/lib/parse.js
+++ b/lib/parse.js
@@ -59,7 +59,8 @@ var OPERATOR_CHARS = makePredicate(characters("+-*&%=<>!?|~^"));
 
 var RE_HEX_NUMBER = /^0x[0-9a-f]+$/i;
 var RE_OCT_NUMBER = /^0[0-7]+$/;
-var RE_BIN_NUMBER = /^0b[01]+$/;
+var RE_ES6_OCT_NUMBER = /^0o[0-7]+$/i;
+var RE_BIN_NUMBER = /^0b[01]+$/i;
 var RE_DEC_NUMBER = /^\d*\.?\d*(?:e[+-]?\d*(?:\d\.?|\.?\d)\d*)?$/i;
 
 var OPERATORS = makePredicate([
@@ -183,6 +184,8 @@ function parse_js_number(num) {
         return parseInt(num.substr(2), 16);
     } else if (RE_OCT_NUMBER.test(num)) {
         return parseInt(num.substr(1), 8);
+    } else if (RE_ES6_OCT_NUMBER.test(num)) {
+        return parseInt(num.substr(2), 8);
     } else if (RE_BIN_NUMBER.test(num)) {
         return parseInt(num.substr(2), 2);
     } else if (RE_DEC_NUMBER.test(num)) {
diff --git a/test/compress/harmony.js b/test/compress/harmony.js
index 02d2b299..82cac95f 100644
--- a/test/compress/harmony.js
+++ b/test/compress/harmony.js
@@ -97,3 +97,18 @@ destructuring_arguments: {
     }
 }
 
+binary_literals: {
+    input: {
+        0b1001;
+        0B1001;
+        0o11;
+        0O11;
+    }
+
+    expect: {
+        9;
+        9;
+        9;
+        9;
+    }
+}