diff --git a/lib/parse.js b/lib/parse.js
index 3f6c8a2..7a4bec9 100644
--- a/lib/parse.js
+++ b/lib/parse.js
@@ -24,10 +24,12 @@ CSSOM.parse = function parse(token) {
 
 	var index;
 	var buffer = "";
+	var valueParenthesisDepth = 0;
 
 	var SIGNIFICANT_WHITESPACE = {
 		"selector": true,
 		"value": true,
+		"value-parenthesis": true,
 		"atRule": true,
 		"importRule-begin": true,
 		"importRule": true,
@@ -263,8 +265,14 @@ CSSOM.parse = function parse(token) {
 					}
 				} else {
 					state = 'value-parenthesis';
+					//always ensure this is reset to 1 on transition
+					//from value to value-parenthesis
+					valueParenthesisDepth = 1;
 					buffer += character;
 				}
+			} else if (state === 'value-parenthesis') {
+				valueParenthesisDepth++;
+				buffer += character;
 			} else {
 				buffer += character;
 			}
@@ -272,7 +280,8 @@ CSSOM.parse = function parse(token) {
 
 		case ")":
 			if (state === 'value-parenthesis') {
-				state = 'value';
+				valueParenthesisDepth--;
+				if (valueParenthesisDepth === 0) state = 'value';
 			}
 			buffer += character;
 			break;
diff --git a/spec/parse.spec.js b/spec/parse.spec.js
index 68fb9f8..653bb22 100644
--- a/spec/parse.spec.js
+++ b/spec/parse.spec.js
@@ -445,6 +445,50 @@ var TESTS = [
 			return result;
 		})()
 	},
+	{
+		input: ".calc{width: calc(100% - 15px);}",
+		result: (function() {
+			var result = {
+				cssRules: [
+					{
+						selectorText: '.calc',
+						parentRule: null,
+						style: {
+							0: 'width',
+							width: 'calc(100% - 15px)',
+							length: 1
+						}
+					}
+				],
+				parentStyleSheet: null
+			};
+			result.cssRules[0].parentStyleSheet = result;
+			result.cssRules[0].style.parentRule = result.cssRules[0];
+			return result;
+		})()
+	},
+	{
+		input: ".gradient{background-image: linear-gradient(transparent 50%, rgba(69, 142, 209, 0.04) 50%);}",
+		result: (function() {
+			var result = {
+				cssRules: [
+					{
+						selectorText: '.gradient',
+						parentRule: null,
+						style: {
+							0: 'background-image',
+							"background-image": 'linear-gradient(transparent 50%, rgba(69, 142, 209, 0.04) 50%)',
+							length: 1
+						}
+					}
+				],
+				parentStyleSheet: null
+			};
+			result.cssRules[0].parentStyleSheet = result;
+			result.cssRules[0].style.parentRule = result.cssRules[0];
+			return result;
+		})()
+	},
 	{
 		input: "@media handheld, only screen and (max-device-width: 480px) {body{max-width:480px}}",
 		result: (function() {