diff --git a/src/ast/conditions.js b/src/ast/conditions.js
index e3d905f..e544e43 100644
--- a/src/ast/conditions.js
+++ b/src/ast/conditions.js
@@ -8,8 +8,8 @@ function isNotEqualTest ( node ) {
 
 function nodesAreEqual ( a, b ) {
 	if ( a.type !== b.type ) return false;
-	if ( a.type === 'Literal' ) return a.value === b.value;
-	if ( a.type === 'Identifier' ) return a.name === b.name;
+	if ( a.type === 'Literal' ) return a.value === b.value
+	if ( a.type === 'Identifier' ) return a.name === b.name && a.name !== 'NaN';
 
 	return false;
 }
@@ -17,7 +17,7 @@ function nodesAreEqual ( a, b ) {
 function nodesAreNotEqual ( a, b ) {
 	if ( a.type !== b.type ) return false;
 	if ( a.type === 'Literal' ) return a.value != b.value;
-	if ( a.type === 'Identifier' ) return a.name != b.name;
+	if ( a.type === 'Identifier' ) return a.name != b.name || a.name === 'NaN';
 
 	return false;
 }
diff --git a/test/function/skips-dead-branches-d/_config.js b/test/function/skips-dead-branches-d/_config.js
index 47111d5..3cc97d3 100644
--- a/test/function/skips-dead-branches-d/_config.js
+++ b/test/function/skips-dead-branches-d/_config.js
@@ -1,7 +1,7 @@
 var assert = require( 'assert' );
 
 module.exports = {
-	description: 'skips a dead branch (c)',
+	description: 'skips a dead branch (d)',
 	code: function ( code ) {
 		assert.equal( code.indexOf( 'obj.foo = function' ), -1, code );
 	}
diff --git a/test/function/skips-dead-branches-e/_config.js b/test/function/skips-dead-branches-e/_config.js
index 47111d5..15deabf 100644
--- a/test/function/skips-dead-branches-e/_config.js
+++ b/test/function/skips-dead-branches-e/_config.js
@@ -1,7 +1,7 @@
 var assert = require( 'assert' );
 
 module.exports = {
-	description: 'skips a dead branch (c)',
+	description: 'skips a dead branch (e)',
 	code: function ( code ) {
 		assert.equal( code.indexOf( 'obj.foo = function' ), -1, code );
 	}
diff --git a/test/function/skips-dead-branches-f/_config.js b/test/function/skips-dead-branches-f/_config.js
new file mode 100644
index 0000000..7893ccb
--- /dev/null
+++ b/test/function/skips-dead-branches-f/_config.js
@@ -0,0 +1,9 @@
+var assert = require( 'assert' );
+
+module.exports = {
+	solo: true,
+	description: 'skips a dead branch (f)',
+	code: function ( code ) {
+		assert.equal( code.indexOf( 'obj.foo = function' ), -1, code );
+	}
+}
diff --git a/test/function/skips-dead-branches-f/main.js b/test/function/skips-dead-branches-f/main.js
new file mode 100644
index 0000000..ab95b46
--- /dev/null
+++ b/test/function/skips-dead-branches-f/main.js
@@ -0,0 +1,11 @@
+var obj = {};
+obj.foo = function () {
+	console.log( 'this should be excluded' );
+}
+
+function bar () {
+	console.log( 'this should be included' );
+}
+
+if ( NaN === NaN ) obj.foo();
+bar();