diff --git a/lib/jasmine-core/jasmine.js b/lib/jasmine-core/jasmine.js
index 616c4961..e5af1c85 100644
--- a/lib/jasmine-core/jasmine.js
+++ b/lib/jasmine-core/jasmine.js
@@ -662,12 +662,6 @@ getJasmineRequireObj().util = function(j$) {
     return descriptor;
   };
 
-  util.objectDifference = function(obj, toRemove) {
-    return j$.MatchersUtil.keys(obj)
-      .filter(key => !util.has(toRemove, key))
-      .map(key => [key, obj[key]]);
-  };
-
   util.has = function(obj, key) {
     return Object.prototype.hasOwnProperty.call(obj, key);
   };
@@ -5609,9 +5603,17 @@ getJasmineRequireObj().MatchersUtil = function(j$) {
     return typeof obj === 'function';
   }
 
+  // Returns an array of [k, v] pairs for eacch property that's in objA
+  // and not in objB.
+  function extraKeysAndValues(objA, objB) {
+    return MatchersUtil.keys(objA)
+      .filter(key => !j$.util.has(objB, key))
+      .map(key => [key, objA[key]]);
+  }
+
   function objectKeysAreDifferentFormatter(pp, actual, expected, path) {
-    var missingProperties = j$.util.objectDifference(expected, actual),
-      extraProperties = j$.util.objectDifference(actual, expected),
+    var missingProperties = extraKeysAndValues(expected, actual),
+      extraProperties = extraKeysAndValues(actual, expected),
       missingPropertiesMessage = formatKeyValuePairs(pp, missingProperties),
       extraPropertiesMessage = formatKeyValuePairs(pp, extraProperties),
       messages = [];
diff --git a/spec/core/UtilSpec.js b/spec/core/UtilSpec.js
index 36f4e8ba..3374479d 100644
--- a/spec/core/UtilSpec.js
+++ b/spec/core/UtilSpec.js
@@ -183,66 +183,6 @@ describe('util', function() {
     });
   });
 
-  describe('objectDifference', function() {
-    it('given two objects A and B, returns the properties in A not present in B', function() {
-      const a = {
-        foo: 3,
-        bar: 4,
-        baz: 5
-      };
-
-      const b = {
-        bar: 6,
-        quux: 7
-      };
-
-      expect(jasmineUnderTest.util.objectDifference(a, b)).toEqual([
-        ['foo', 3],
-        ['baz', 5]
-      ]);
-    });
-
-    it('includes Symbol keys', function() {
-      const missing = Symbol('missing');
-      const both = Symbol('both');
-      const symbolDuplicated1 = Symbol('symbolDuplicated');
-      const symbolDuplicated2 = Symbol('symbolDuplicated');
-      const added = Symbol('added');
-      const a = {
-        [missing]: 1,
-        [both]: 2,
-        [symbolDuplicated1]: 3
-      };
-
-      const b = {
-        [both]: 'anything',
-        [symbolDuplicated2]: 4,
-        [added]: 5
-      };
-
-      expect(jasmineUnderTest.util.objectDifference(a, b)).toEqual([
-        [missing, 1],
-        [symbolDuplicated1, 3]
-      ]);
-    });
-
-    it('only looks at own properties of both objects', function() {
-      function Foo() {}
-
-      Foo.prototype.x = 1;
-      Foo.prototype.y = 2;
-
-      const a = new Foo();
-      a.x = 1;
-
-      const b = new Foo();
-      b.y = 2;
-
-      expect(jasmineUnderTest.util.objectDifference(a, b)).toEqual([['x', 1]]);
-      expect(jasmineUnderTest.util.objectDifference(b, a)).toEqual([['y', 2]]);
-    });
-  });
-
   describe('jasmineFile', function() {
     it('returns the file containing jasmine.util', function() {
       // Chrome sometimes reports foo.js as foo.js/, so tolerate
diff --git a/src/core/matchers/matchersUtil.js b/src/core/matchers/matchersUtil.js
index 0bf2a57f..9a3a586e 100644
--- a/src/core/matchers/matchersUtil.js
+++ b/src/core/matchers/matchersUtil.js
@@ -558,9 +558,17 @@ getJasmineRequireObj().MatchersUtil = function(j$) {
     return typeof obj === 'function';
   }
 
+  // Returns an array of [k, v] pairs for eacch property that's in objA
+  // and not in objB.
+  function extraKeysAndValues(objA, objB) {
+    return MatchersUtil.keys(objA)
+      .filter(key => !j$.util.has(objB, key))
+      .map(key => [key, objA[key]]);
+  }
+
   function objectKeysAreDifferentFormatter(pp, actual, expected, path) {
-    var missingProperties = j$.util.objectDifference(expected, actual),
-      extraProperties = j$.util.objectDifference(actual, expected),
+    var missingProperties = extraKeysAndValues(expected, actual),
+      extraProperties = extraKeysAndValues(actual, expected),
       missingPropertiesMessage = formatKeyValuePairs(pp, missingProperties),
       extraPropertiesMessage = formatKeyValuePairs(pp, extraProperties),
       messages = [];
diff --git a/src/core/util.js b/src/core/util.js
index f2b7eb7d..cd4170d4 100644
--- a/src/core/util.js
+++ b/src/core/util.js
@@ -75,12 +75,6 @@ getJasmineRequireObj().util = function(j$) {
     return descriptor;
   };
 
-  util.objectDifference = function(obj, toRemove) {
-    return j$.MatchersUtil.keys(obj)
-      .filter(key => !util.has(toRemove, key))
-      .map(key => [key, obj[key]]);
-  };
-
   util.has = function(obj, key) {
     return Object.prototype.hasOwnProperty.call(obj, key);
   };