diff --git a/lib/jasmine-core/jasmine.js b/lib/jasmine-core/jasmine.js
index ba1ef9f2..492f70ef 100644
--- a/lib/jasmine-core/jasmine.js
+++ b/lib/jasmine-core/jasmine.js
@@ -4278,9 +4278,9 @@ getJasmineRequireObj().toBeNegativeInfinity = function(j$) {
         };
 
         if (result.pass) {
-          result.message = 'Expected actual to be -Infinity.';
+          result.message = 'Expected actual not to be -Infinity.';
         } else {
-          result.message = function() { return 'Expected ' + j$.pp(actual) + ' not to be -Infinity.'; };
+          result.message = function() { return 'Expected ' + j$.pp(actual) + ' to be -Infinity.'; };
         }
 
         return result;
@@ -4328,9 +4328,9 @@ getJasmineRequireObj().toBePositiveInfinity = function(j$) {
         };
 
         if (result.pass) {
-          result.message = 'Expected actual to be Infinity.';
+          result.message = 'Expected actual not to be Infinity.';
         } else {
-          result.message = function() { return 'Expected ' + j$.pp(actual) + ' not to be Infinity.'; };
+          result.message = function() { return 'Expected ' + j$.pp(actual) + ' to be Infinity.'; };
         }
 
         return result;
diff --git a/spec/core/matchers/toBeNegativeInfinitySpec.js b/spec/core/matchers/toBeNegativeInfinitySpec.js
index 8b544412..4aca8978 100644
--- a/spec/core/matchers/toBeNegativeInfinitySpec.js
+++ b/spec/core/matchers/toBeNegativeInfinitySpec.js
@@ -17,7 +17,7 @@ describe("toBeNegativeInfinity", function() {
     var matcher = jasmineUnderTest.matchers.toBeNegativeInfinity(),
       result = matcher.compare(0);
 
-    expect(result.message()).toEqual("Expected 0 not to be -Infinity.")
+    expect(result.message()).toEqual("Expected 0 to be -Infinity.")
   });
 
   it("succeeds for -Infinity", function() {
@@ -25,7 +25,7 @@ describe("toBeNegativeInfinity", function() {
       result = matcher.compare(Number.NEGATIVE_INFINITY);
 
     expect(result.pass).toBe(true);
-    expect(result.message).toEqual("Expected actual to be -Infinity.")
+    expect(result.message).toEqual("Expected actual not to be -Infinity.")
   });
 
 });
diff --git a/spec/core/matchers/toBePositiveInfinitySpec.js b/spec/core/matchers/toBePositiveInfinitySpec.js
index 73d6285b..239833d9 100644
--- a/spec/core/matchers/toBePositiveInfinitySpec.js
+++ b/spec/core/matchers/toBePositiveInfinitySpec.js
@@ -17,7 +17,7 @@ describe("toBePositiveInfinity", function() {
     var matcher = jasmineUnderTest.matchers.toBePositiveInfinity(),
       result = matcher.compare(0);
 
-    expect(result.message()).toEqual("Expected 0 not to be Infinity.")
+    expect(result.message()).toEqual("Expected 0 to be Infinity.")
   });
 
   it("succeeds for Infinity", function() {
@@ -25,7 +25,7 @@ describe("toBePositiveInfinity", function() {
       result = matcher.compare(Number.POSITIVE_INFINITY);
 
     expect(result.pass).toBe(true);
-    expect(result.message).toEqual("Expected actual to be Infinity.")
+    expect(result.message).toEqual("Expected actual not to be Infinity.")
   });
 
 });
diff --git a/src/core/matchers/toBeNegativeInfinity.js b/src/core/matchers/toBeNegativeInfinity.js
index 849c4c69..d7d24d59 100644
--- a/src/core/matchers/toBeNegativeInfinity.js
+++ b/src/core/matchers/toBeNegativeInfinity.js
@@ -14,9 +14,9 @@ getJasmineRequireObj().toBeNegativeInfinity = function(j$) {
         };
 
         if (result.pass) {
-          result.message = 'Expected actual to be -Infinity.';
+          result.message = 'Expected actual not to be -Infinity.';
         } else {
-          result.message = function() { return 'Expected ' + j$.pp(actual) + ' not to be -Infinity.'; };
+          result.message = function() { return 'Expected ' + j$.pp(actual) + ' to be -Infinity.'; };
         }
 
         return result;
diff --git a/src/core/matchers/toBePositiveInfinity.js b/src/core/matchers/toBePositiveInfinity.js
index ec70971c..60acded4 100644
--- a/src/core/matchers/toBePositiveInfinity.js
+++ b/src/core/matchers/toBePositiveInfinity.js
@@ -14,9 +14,9 @@ getJasmineRequireObj().toBePositiveInfinity = function(j$) {
         };
 
         if (result.pass) {
-          result.message = 'Expected actual to be Infinity.';
+          result.message = 'Expected actual not to be Infinity.';
         } else {
-          result.message = function() { return 'Expected ' + j$.pp(actual) + ' not to be Infinity.'; };
+          result.message = function() { return 'Expected ' + j$.pp(actual) + ' to be Infinity.'; };
         }
 
         return result;