diff --git a/src/classic/element/ReactElementValidator.js b/src/classic/element/ReactElementValidator.js
index 06b9fc2b5c..cefc9899b2 100644
--- a/src/classic/element/ReactElementValidator.js
+++ b/src/classic/element/ReactElementValidator.js
@@ -269,7 +269,7 @@ function checkPropTypes(componentName, propTypes, props, location) {
         loggedTypeFailures[error.message] = true;
 
         var addendum = getDeclarationErrorAddendum(this);
-        warning(false, error.message + addendum);
+        warning(false, 'Failed propType: ' + error.message + addendum);
       }
     }
   }
diff --git a/src/classic/element/__tests__/ReactElementValidator-test.js b/src/classic/element/__tests__/ReactElementValidator-test.js
index 311be0377b..130b8d1eea 100644
--- a/src/classic/element/__tests__/ReactElementValidator-test.js
+++ b/src/classic/element/__tests__/ReactElementValidator-test.js
@@ -206,7 +206,8 @@ describe('ReactElementValidator', function() {
     });
     ReactTestUtils.renderIntoDocument(React.createElement(ParentComp));
     expect(console.warn.calls[0].args[0]).toBe(
-      'Warning: Invalid prop `color` of type `number` supplied to `MyComp`, ' +
+      'Warning: Failed propType: ' +
+      'Invalid prop `color` of type `number` supplied to `MyComp`, ' +
       'expected `string`. Check the render method of `ParentComp`.'
     );
   });
@@ -247,7 +248,8 @@ describe('ReactElementValidator', function() {
 
     expect(console.warn.calls.length).toBe(1);
     expect(console.warn.calls[0].args[0]).toBe(
-      'Warning: Required prop `prop` was not specified in `Component`.'
+      'Warning: Failed propType: ' +
+      'Required prop `prop` was not specified in `Component`.'
     );
   });
 
@@ -270,7 +272,8 @@ describe('ReactElementValidator', function() {
 
     expect(console.warn.calls.length).toBe(1);
     expect(console.warn.calls[0].args[0]).toBe(
-      'Warning: Required prop `prop` was not specified in `Component`.'
+      'Warning: Failed propType: ' +
+      'Required prop `prop` was not specified in `Component`.'
     );
   });
 
@@ -295,11 +298,13 @@ describe('ReactElementValidator', function() {
 
     expect(console.warn.calls.length).toBe(2);
     expect(console.warn.calls[0].args[0]).toBe(
-      'Warning: Required prop `prop` was not specified in `Component`.'
+      'Warning: Failed propType: ' +
+      'Required prop `prop` was not specified in `Component`.'
     );
 
     expect(console.warn.calls[1].args[0]).toBe(
-      'Warning: Invalid prop `prop` of type `number` supplied to ' +
+      'Warning: Failed propType: ' +
+      'Invalid prop `prop` of type `number` supplied to ' +
       '`Component`, expected `string`.'
     );
 
diff --git a/src/classic/types/__tests__/ReactPropTypes-test.js b/src/classic/types/__tests__/ReactPropTypes-test.js
index fe0ad4a340..0c0ee7d189 100644
--- a/src/classic/types/__tests__/ReactPropTypes-test.js
+++ b/src/classic/types/__tests__/ReactPropTypes-test.js
@@ -752,7 +752,8 @@ describe('ReactPropTypes', function() {
       var instance = <Component num={6} />;
       instance = ReactTestUtils.renderIntoDocument(instance);
       expect(console.warn.argsForCall.length).toBe(1);
-      expect(console.warn.argsForCall[0][0]).toBe('Warning: num must be 5!');
+      expect(console.warn.argsForCall[0][0]).toBe(
+      'Warning: Failed propType: num must be 5!');
     });
 
     it('should not warn if the validator returned anything else than an error',
diff --git a/src/modern/element/__tests__/ReactJSXElementValidator-test.js b/src/modern/element/__tests__/ReactJSXElementValidator-test.js
index 5ed0823dc7..3bb211aec8 100644
--- a/src/modern/element/__tests__/ReactJSXElementValidator-test.js
+++ b/src/modern/element/__tests__/ReactJSXElementValidator-test.js
@@ -196,7 +196,8 @@ describe('ReactJSXElementValidator', function() {
     }
     ReactTestUtils.renderIntoDocument(<ParentComp />);
     expect(console.warn.calls[0].args[0]).toBe(
-      'Warning: Invalid prop `color` of type `number` supplied to `MyComp`, ' +
+      'Warning: Failed propType: ' +
+      'Invalid prop `color` of type `number` supplied to `MyComp`, ' +
       'expected `string`. Check the render method of `ParentComp`.'
     );
   });
@@ -236,7 +237,8 @@ describe('ReactJSXElementValidator', function() {
 
     expect(console.warn.calls.length).toBe(1);
     expect(console.warn.calls[0].args[0]).toBe(
-      'Warning: Required prop `prop` was not specified in `Component`.'
+      'Warning: Failed propType: ' +
+      'Required prop `prop` was not specified in `Component`.'
     );
   });
 
@@ -255,7 +257,8 @@ describe('ReactJSXElementValidator', function() {
 
     expect(console.warn.calls.length).toBe(1);
     expect(console.warn.calls[0].args[0]).toBe(
-      'Warning: Required prop `prop` was not specified in `Component`.'
+      'Warning: Failed propType: ' +
+      'Required prop `prop` was not specified in `Component`.'
     );
   });
 
@@ -276,11 +279,13 @@ describe('ReactJSXElementValidator', function() {
 
     expect(console.warn.calls.length).toBe(2);
     expect(console.warn.calls[0].args[0]).toBe(
-      'Warning: Required prop `prop` was not specified in `Component`.'
+      'Warning: Failed propType: ' +
+      'Required prop `prop` was not specified in `Component`.'
     );
 
     expect(console.warn.calls[1].args[0]).toBe(
-      'Warning: Invalid prop `prop` of type `number` supplied to ' +
+      'Warning: Failed propType: ' +
+      'Invalid prop `prop` of type `number` supplied to ' +
       '`Component`, expected `string`.'
     );