diff --git a/contracts/adapters/Manager.sol b/contracts/adapters/Manager.sol
index 68b4fbace..b71a19c29 100644
--- a/contracts/adapters/Manager.sol
+++ b/contracts/adapters/Manager.sol
@@ -190,10 +190,21 @@ contract Manager is Reimbursable, AdapterGuard, Signatures {
         }
 
         if (proposal.adapterOrExtensionAddr != address(0x0)) {
-            dao.addExtension(
-                proposal.adapterOrExtensionId,
-                IExtension(proposal.adapterOrExtensionAddr)
-            );
+            try
+                dao.addExtension(
+                    proposal.adapterOrExtensionId,
+                    IExtension(proposal.adapterOrExtensionAddr)
+                )
+            {} catch {
+                // v1.0.6 signature
+                dao.addExtension(
+                    proposal.adapterOrExtensionId,
+                    IExtension(proposal.adapterOrExtensionAddr),
+                    // The creator of the extension must be set as the DAO owner,
+                    // which is stored at index 0 in the members storage.
+                    dao.getMemberAddress(0)
+                );
+            }
         }
     }
 
diff --git a/contracts/core/DaoRegistry.sol b/contracts/core/DaoRegistry.sol
index edba14652..5e0b94e0a 100644
--- a/contracts/core/DaoRegistry.sol
+++ b/contracts/core/DaoRegistry.sol
@@ -386,6 +386,15 @@ contract DaoRegistry is MemberGuard, AdapterGuard {
         emit ExtensionAdded(extensionId, address(extension));
     }
 
+    // v1.0.6 signature
+    function addExtension(
+        bytes32,
+        IExtension,
+        address
+    ) external {
+        revert("not implemented");
+    }
+
     /**
      * @notice Removes an adapter from the registry
      * @param extensionId The unique identifier of the extension
diff --git a/test/core/dao-registry.test.js b/test/core/dao-registry.test.js
index f28aa07f9..0a93ba45b 100644
--- a/test/core/dao-registry.test.js
+++ b/test/core/dao-registry.test.js
@@ -792,7 +792,10 @@ describe("Core - DaoRegistry", () => {
 
     it("should not be possible to call addExtension without the ADD_EXTENSION permission", async () => {
       await expect(
-        this.dao.addExtension(sha3("extension1"), accounts[2])
+        this.dao["addExtension(bytes32,address)"](
+          sha3("extension1"),
+          accounts[2]
+        )
       ).to.be.revertedWith("accessDenied");
     });
 
diff --git a/utils/deployment-util.js b/utils/deployment-util.js
index 9ad55cf5b..85deaf27c 100644
--- a/utils/deployment-util.js
+++ b/utils/deployment-util.js
@@ -178,7 +178,10 @@ const createExtensions = async ({ dao, factories, options }) => {
       );
 
     await waitTx(
-      dao.addExtension(sha3(newExtension.configs.id), newExtension.address)
+      dao["addExtension(bytes32,address)"](
+        sha3(newExtension.configs.id),
+        newExtension.address
+      )
     );
 
     info(`