diff --git a/lib/jasmine-core/jasmine.js b/lib/jasmine-core/jasmine.js
index 10bf8a12..d3e6872a 100644
--- a/lib/jasmine-core/jasmine.js
+++ b/lib/jasmine-core/jasmine.js
@@ -1618,6 +1618,8 @@ getJasmineRequireObj().pp = function(j$) {
         this.emitScalar('HTMLNode');
       } else if (value instanceof Date) {
         this.emitScalar('Date(' + value + ')');
+      } else if (value.toString && typeof value === 'object' && !(value instanceof Array) && value.toString !== Object.prototype.toString) {
+        this.emitScalar(value.toString());
       } else if (j$.util.arrayContains(this.seen, value)) {
         this.emitScalar('<circular reference: ' + (j$.isArray_(value) ? 'Array' : 'Object') + '>');
       } else if (j$.isArray_(value) || j$.isA_('Object', value)) {
diff --git a/spec/core/PrettyPrintSpec.js b/spec/core/PrettyPrintSpec.js
index 2686c154..6d818a8f 100644
--- a/spec/core/PrettyPrintSpec.js
+++ b/spec/core/PrettyPrintSpec.js
@@ -181,6 +181,14 @@ describe("j$.pp", function () {
     expect(j$.pp(obj)).toEqual("strung");
   });
 
+  it("should stringify objects that implement custom toString", function () {
+    var obj = {
+      toString: function () { return "my toString"; }
+    };
+
+    expect(j$.pp(obj)).toEqual("my toString");
+  });
+
   it("should handle objects with null prototype", function() {
     if (jasmine.getEnv().ieVersion < 9) { return; }
 
diff --git a/src/core/PrettyPrinter.js b/src/core/PrettyPrinter.js
index 8f86b5d8..e9452961 100644
--- a/src/core/PrettyPrinter.js
+++ b/src/core/PrettyPrinter.js
@@ -30,6 +30,8 @@ getJasmineRequireObj().pp = function(j$) {
         this.emitScalar('HTMLNode');
       } else if (value instanceof Date) {
         this.emitScalar('Date(' + value + ')');
+      } else if (value.toString && typeof value === 'object' && !(value instanceof Array) && value.toString !== Object.prototype.toString) {
+        this.emitScalar(value.toString());
       } else if (j$.util.arrayContains(this.seen, value)) {
         this.emitScalar('<circular reference: ' + (j$.isArray_(value) ? 'Array' : 'Object') + '>');
       } else if (j$.isArray_(value) || j$.isA_('Object', value)) {