diff --git a/lib/expression/node/FunctionAssignmentNode.js b/lib/expression/node/FunctionAssignmentNode.js
index 5eb9ad3c7..c2a8d5477 100644
--- a/lib/expression/node/FunctionAssignmentNode.js
+++ b/lib/expression/node/FunctionAssignmentNode.js
@@ -3,6 +3,7 @@
 var Node = require('./Node');
 var keywords = require('../keywords');
 var latex = require('../../util/latex');
+var operators = require('../operators');
 var isString = require('../../util/string').isString;
 var isArray = Array.isArray;
 
@@ -96,9 +97,15 @@ FunctionAssignmentNode.prototype.clone = function() {
  * @return {String} str
  */
 FunctionAssignmentNode.prototype.toString = function() {
+  var precedence = operators.getPrecedence(this);
+  var exprPrecedence = operators.getPrecedence(this.expr);
+
+  var expr = this.expr.toString();
+  if ((exprPrecedence !== null) && (exprPrecedence <= precedence)) {
+    expr = '(' + expr + ')';
+  }
   return 'function ' + this.name +
-      '(' + this.params.join(', ') + ') = ' +
-      this.expr.toString();
+      '(' + this.params.join(', ') + ') = ' + expr;
 };
 
 /**
diff --git a/test/expression/node/FunctionAssignmentNode.test.js b/test/expression/node/FunctionAssignmentNode.test.js
index e48260c76..6f3cc3c22 100644
--- a/test/expression/node/FunctionAssignmentNode.test.js
+++ b/test/expression/node/FunctionAssignmentNode.test.js
@@ -6,6 +6,7 @@ var assert = require('assert'),
     ConstantNode = require('../../../lib/expression/node/ConstantNode'),
     OperatorNode = require('../../../lib/expression/node/OperatorNode'),
     FunctionAssignmentNode = require('../../../lib/expression/node/FunctionAssignmentNode'),
+    AssignmentNode = require('../../../lib/expression/node/AssignmentNode'),
     RangeNode = require('../../../lib/expression/node/RangeNode'),
     SymbolNode = require('../../../lib/expression/node/SymbolNode');
 
@@ -178,6 +179,15 @@ describe('FunctionAssignmentNode', function() {
     assert.equal(n.toString(), 'function f(x) = 2 + x');
   });
 
+  it ('should stringify a FunctionAssignmentNode conataining an AssignmentNode', function () {
+    var a = new ConstantNode(2);
+
+    var n1 = new AssignmentNode('a', a);
+    var n = new FunctionAssignmentNode('f', ['x'], n1);
+
+    assert.equal(n.toString(), 'function f(x) = (a = 2)');
+  });
+
   it ('should LaTeX a FunctionAssignmentNode', function() {
     var a = new ConstantNode(2);
     var x = new SymbolNode('x');