diff --git a/contracts/proxy/utils/Initializable.sol b/contracts/proxy/utils/Initializable.sol
index 856160b8d..eb4ebb8a4 100644
--- a/contracts/proxy/utils/Initializable.sol
+++ b/contracts/proxy/utils/Initializable.sol
@@ -79,7 +79,7 @@ abstract contract Initializable {
     /**
      * @dev The contract is already initialized.
      */
-    error AlreadyInitialized();
+    error InvalidInitialization();
 
     /**
      * @dev The contract is not initializing.
@@ -118,7 +118,7 @@ abstract contract Initializable {
         bool construction = initialized == 1 && address(this).code.length == 0;
 
         if (!initialSetup && !construction) {
-            revert AlreadyInitialized();
+            revert InvalidInitialization();
         }
         $._initialized = 1;
         if (isTopLevelCall) {
@@ -154,7 +154,7 @@ abstract contract Initializable {
         InitializableStorage storage $ = _getInitializableStorage();
 
         if ($._initializing || $._initialized >= version) {
-            revert AlreadyInitialized();
+            revert InvalidInitialization();
         }
         $._initialized = version;
         $._initializing = true;
@@ -194,7 +194,7 @@ abstract contract Initializable {
         InitializableStorage storage $ = _getInitializableStorage();
 
         if ($._initializing) {
-            revert AlreadyInitialized();
+            revert InvalidInitialization();
         }
         if ($._initialized != type(uint64).max) {
             $._initialized = type(uint64).max;
diff --git a/test/proxy/utils/Initializable.test.js b/test/proxy/utils/Initializable.test.js
index 98ed19d36..b9ff3b052 100644
--- a/test/proxy/utils/Initializable.test.js
+++ b/test/proxy/utils/Initializable.test.js
@@ -42,13 +42,13 @@ contract('Initializable', function () {
       });
 
       it('initializer does not run again', async function () {
-        await expectRevertCustomError(this.contract.initialize(), 'AlreadyInitialized', []);
+        await expectRevertCustomError(this.contract.initialize(), 'InvalidInitialization', []);
       });
     });
 
     describe('nested under an initializer', function () {
       it('initializer modifier reverts', async function () {
-        await expectRevertCustomError(this.contract.initializerNested(), 'AlreadyInitialized', []);
+        await expectRevertCustomError(this.contract.initializerNested(), 'InvalidInitialization', []);
       });
 
       it('onlyInitializing modifier succeeds', async function () {
@@ -100,9 +100,9 @@ contract('Initializable', function () {
 
     it('cannot nest reinitializers', async function () {
       expect(await this.contract.counter()).to.be.bignumber.equal('0');
-      await expectRevertCustomError(this.contract.nestedReinitialize(2, 2), 'AlreadyInitialized', []);
-      await expectRevertCustomError(this.contract.nestedReinitialize(2, 3), 'AlreadyInitialized', []);
-      await expectRevertCustomError(this.contract.nestedReinitialize(3, 2), 'AlreadyInitialized', []);
+      await expectRevertCustomError(this.contract.nestedReinitialize(2, 2), 'InvalidInitialization', []);
+      await expectRevertCustomError(this.contract.nestedReinitialize(2, 3), 'InvalidInitialization', []);
+      await expectRevertCustomError(this.contract.nestedReinitialize(3, 2), 'InvalidInitialization', []);
     });
 
     it('can chain reinitializers', async function () {
@@ -121,18 +121,18 @@ contract('Initializable', function () {
     describe('contract locking', function () {
       it('prevents initialization', async function () {
         await this.contract.disableInitializers();
-        await expectRevertCustomError(this.contract.initialize(), 'AlreadyInitialized', []);
+        await expectRevertCustomError(this.contract.initialize(), 'InvalidInitialization', []);
       });
 
       it('prevents re-initialization', async function () {
         await this.contract.disableInitializers();
-        await expectRevertCustomError(this.contract.reinitialize(255), 'AlreadyInitialized', []);
+        await expectRevertCustomError(this.contract.reinitialize(255), 'InvalidInitialization', []);
       });
 
       it('can lock contract after initialization', async function () {
         await this.contract.initialize();
         await this.contract.disableInitializers();
-        await expectRevertCustomError(this.contract.reinitialize(255), 'AlreadyInitialized', []);
+        await expectRevertCustomError(this.contract.reinitialize(255), 'InvalidInitialization', []);
       });
     });
   });
@@ -207,8 +207,8 @@ contract('Initializable', function () {
 
   describe('disabling initialization', function () {
     it('old and new patterns in bad sequence', async function () {
-      await expectRevertCustomError(DisableBad1.new(), 'AlreadyInitialized', []);
-      await expectRevertCustomError(DisableBad2.new(), 'AlreadyInitialized', []);
+      await expectRevertCustomError(DisableBad1.new(), 'InvalidInitialization', []);
+      await expectRevertCustomError(DisableBad2.new(), 'InvalidInitialization', []);
     });
 
     it('old and new patterns in good sequence', async function () {