diff --git a/lib/jasmine-core/jasmine.js b/lib/jasmine-core/jasmine.js
index 9f47affd..bf1ddb4e 100644
--- a/lib/jasmine-core/jasmine.js
+++ b/lib/jasmine-core/jasmine.js
@@ -187,6 +187,10 @@ getJasmineRequireObj().base = function(j$) {
     }
     return obj;
   };
+
+  j$.addCustomEqualityTester = function(tester) {
+    j$.getEnv().addCustomEqualityTester(tester);
+  };
 };
 
 getJasmineRequireObj().util = function() {
diff --git a/src/core/base.js b/src/core/base.js
index d36326b3..00763e5b 100644
--- a/src/core/base.js
+++ b/src/core/base.js
@@ -96,4 +96,8 @@ getJasmineRequireObj().base = function(j$) {
     }
     return obj;
   };
+
+  j$.addCustomEqualityTester = function(tester) {
+    j$.getEnv().addCustomEqualityTester(tester);
+  };
 };