diff --git a/build/scscript.js b/build/scscript.js
index 349c3ed..36d3d43 100644
--- a/build/scscript.js
+++ b/build/scscript.js
@@ -1,7 +1,7 @@
 (function(global) {
 "use strict";
 
-var sc = { VERSION: "0.0.24" };
+var sc = { VERSION: "0.0.25" };
 
 // src/sc/sc.js
 (function(sc) {
@@ -2547,20 +2547,30 @@ var sc = { VERSION: "0.0.24" };
 
   // 4.6 Unary Expressions
   SCParser.prototype.parseUnaryExpression = function(node) {
-    var token, expr;
+    var token, expr, method;
     var marker;
 
     marker = Marker.create(this.lexer);
 
-    if (this.match("`")) {
+    switch (this.matchAny([ "`", "-" ])) {
+    case "`":
       token = this.lex();
-      expr = this.parseUnaryExpression();
+      expr = this.parseLeftHandSideExpression();
       expr = Node.createUnaryExpression(token.value, expr);
-    } else {
+      break;
+    case "-":
+      token = this.lex();
+      method = Node.createIdentifier("neg");
+      method = marker.update().apply(method);
+      expr = this.parseLeftHandSideExpression();
+      expr = Node.createCallExpression(expr, method, { list: [] }, ".");
+      break;
+    default:
       expr = this.parseLeftHandSideExpression(node);
+      break;
     }
 
-    return marker.update().apply(expr);
+    return marker.update().apply(expr, true);
   };
 
   // 4.7 LeftHandSide Expressions
diff --git a/package.json b/package.json
index cdebc37..daaca4a 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "scscript",
-  "version": "0.0.24",
+  "version": "0.0.25",
   "author": "Nao Yonamine <mohayonao@gmail.com>",
   "homepage": "http://mohayonao.github.io/SCScript/",
   "bugs": "https://github.com/mohayonao/SCScript/issues",
diff --git a/src/sc/lang/compiler/parser.js b/src/sc/lang/compiler/parser.js
index 304ca79..92f33a9 100644
--- a/src/sc/lang/compiler/parser.js
+++ b/src/sc/lang/compiler/parser.js
@@ -590,20 +590,30 @@
 
   // 4.6 Unary Expressions
   SCParser.prototype.parseUnaryExpression = function(node) {
-    var token, expr;
+    var token, expr, method;
     var marker;
 
     marker = Marker.create(this.lexer);
 
-    if (this.match("`")) {
+    switch (this.matchAny([ "`", "-" ])) {
+    case "`":
       token = this.lex();
-      expr = this.parseUnaryExpression();
+      expr = this.parseLeftHandSideExpression();
       expr = Node.createUnaryExpression(token.value, expr);
-    } else {
+      break;
+    case "-":
+      token = this.lex();
+      method = Node.createIdentifier("neg");
+      method = marker.update().apply(method);
+      expr = this.parseLeftHandSideExpression();
+      expr = Node.createCallExpression(expr, method, { list: [] }, ".");
+      break;
+    default:
       expr = this.parseLeftHandSideExpression(node);
+      break;
     }
 
-    return marker.update().apply(expr);
+    return marker.update().apply(expr, true);
   };
 
   // 4.7 LeftHandSide Expressions
diff --git a/src/sc/lang/compiler/parser_test.js b/src/sc/lang/compiler/parser_test.js
index 99d6c3a..0930110 100644
--- a/src/sc/lang/compiler/parser_test.js
+++ b/src/sc/lang/compiler/parser_test.js
@@ -211,7 +211,7 @@
           error({ line: 1, column: 2, index: 1 }, Message.UnexpectedToken, "ILLEGAL"),
         ],
         "``": [
-          error({ line: 1, column: 3, index: 2 }, Message.UnexpectedEOS),
+          error({ line: 1, column: 2, index: 1 }, Message.UnexpectedToken, "`"),
         ],
         "[1": [
           error({ line: 1, column: 3, index: 2 }, Message.UnexpectedEOS),
diff --git a/src/sc/lang/compiler/test-cases.js b/src/sc/lang/compiler/test-cases.js
index 75b0fb2..52d0819 100644
--- a/src/sc/lang/compiler/test-cases.js
+++ b/src/sc/lang/compiler/test-cases.js
@@ -82,6 +82,53 @@
         }
       }
     },
+    "-a": {
+      compiled: [
+        "SCScript(function($this, $SC) {",
+        "  return $this.a().neg();",
+        "});",
+      ],
+      ast: {
+        type: Syntax.Program,
+        body: [
+          {
+            type: Syntax.CallExpression,
+            stamp: ".",
+            callee: {
+              type: Syntax.Identifier,
+              name: "a",
+              range: [ 1, 2 ],
+              loc: {
+                start: { line: 1, column: 1 },
+                end  : { line: 1, column: 2 }
+              }
+            },
+            method: {
+              type: Syntax.Identifier,
+              name: "neg",
+              range: [ 0, 1 ],
+              loc: {
+                start: { line: 1, column: 0 },
+                end  : { line: 1, column: 1 }
+              }
+            },
+            args: {
+              list: []
+            },
+            range: [ 0, 2 ],
+            loc: {
+              start: { line: 1, column: 0 },
+              end  : { line: 1, column: 2 }
+            }
+          }
+        ],
+        range: [ 0, 2 ],
+        loc: {
+          start: { line: 1, column: 0 },
+          end  : { line: 1, column: 2 }
+        }
+      }
+    },
     "nil": {
       compiled: [
         "SCScript(function($this, $SC) {",
@@ -3520,9 +3567,9 @@
               type: Syntax.FunctionExpression,
               body: [],
               closed: true,
-              range: [ 5, 7 ],
+              range: [ 4, 7 ],
               loc: {
-                start: { line: 1, column: 5 },
+                start: { line: 1, column: 4 },
                 end  : { line: 1, column: 7 }
               }
             },