diff --git a/public/app/features/alerting/unified/hooks/ruleGroup/__snapshots__/useMoveRuleFromRuleGroup.test.tsx.snap b/public/app/features/alerting/unified/hooks/ruleGroup/__snapshots__/useMoveRuleFromRuleGroup.test.tsx.snap
index 2374935f47a..d5ff767a76f 100644
--- a/public/app/features/alerting/unified/hooks/ruleGroup/__snapshots__/useMoveRuleFromRuleGroup.test.tsx.snap
+++ b/public/app/features/alerting/unified/hooks/ruleGroup/__snapshots__/useMoveRuleFromRuleGroup.test.tsx.snap
@@ -1,5 +1,50 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
+exports[`Moving a Data source managed rule should move a rule in a namespace to another existing namespace 1`] = `
+[
+  {
+    "body": {
+      "name": "group-1",
+      "rules": [
+        {
+          "alert": "alert1",
+          "annotations": {
+            "summary": "test alert",
+          },
+          "expr": "up = 1",
+          "labels": {
+            "severity": "warning",
+          },
+        },
+      ],
+    },
+    "headers": [
+      [
+        "content-type",
+        "application/json",
+      ],
+      [
+        "accept",
+        "application/json, text/plain, */*",
+      ],
+    ],
+    "method": "POST",
+    "url": "http://localhost/api/ruler/mimir/api/v1/rules/namespace-2?subtype=mimir",
+  },
+  {
+    "body": "",
+    "headers": [
+      [
+        "accept",
+        "application/json, text/plain, */*",
+      ],
+    ],
+    "method": "DELETE",
+    "url": "http://localhost/api/ruler/mimir/api/v1/rules/namespace-1/group-1?subtype=mimir",
+  },
+]
+`;
+
 exports[`Moving a Data source managed rule should move a rule in an existing group to a new group 1`] = `
 [
   {
@@ -125,7 +170,7 @@ exports[`Moving a Data source managed rule should move a rule in an existing gro
       ],
     ],
     "method": "POST",
-    "url": "http://localhost/api/ruler/mimir/api/v1/rules/namespace-1?subtype=mimir",
+    "url": "http://localhost/api/ruler/mimir/api/v1/rules/namespace-2?subtype=mimir",
   },
   {
     "body": "",
diff --git a/public/app/features/alerting/unified/hooks/ruleGroup/useMoveRuleFromRuleGroup.test.tsx b/public/app/features/alerting/unified/hooks/ruleGroup/useMoveRuleFromRuleGroup.test.tsx
index 2fda700d4ac..4426b16de92 100644
--- a/public/app/features/alerting/unified/hooks/ruleGroup/useMoveRuleFromRuleGroup.test.tsx
+++ b/public/app/features/alerting/unified/hooks/ruleGroup/useMoveRuleFromRuleGroup.test.tsx
@@ -184,6 +184,45 @@ describe('Moving a Data source managed rule', () => {
     expect(serializedRequests).toMatchSnapshot();
   });
 
+  it('should move a rule in a namespace to another existing namespace', async () => {
+    const capture = captureRequests((r) => r.method === 'POST' || r.method === 'DELETE');
+
+    const ruleToMove = group1.rules[0];
+
+    const coreRuleGroup = {
+      dataSourceName: MIMIR_DATASOURCE_UID,
+      groupName: group1.name,
+    };
+
+    const currentRuleGroupID: RuleGroupIdentifier = {
+      ...coreRuleGroup,
+      namespaceName: NAMESPACE_1,
+    };
+
+    const targetRuleGroupID: RuleGroupIdentifier = {
+      ...coreRuleGroup,
+      namespaceName: NAMESPACE_2,
+    };
+
+    const ruleID = fromRulerRuleAndRuleGroupIdentifier(currentRuleGroupID, ruleToMove);
+
+    const { user } = render(
+      <MoveRuleTestComponent
+        currentRuleGroupIdentifier={currentRuleGroupID}
+        targetRuleGroupIdentifier={targetRuleGroupID}
+        ruleID={ruleID}
+        rule={ruleToMove}
+      />
+    );
+    await user.click(byRole('button').get());
+
+    expect(await byText(/success/i).find()).toBeInTheDocument();
+
+    const requests = await capture;
+    const serializedRequests = await serializeRequests(requests);
+    expect(serializedRequests).toMatchSnapshot();
+  });
+
   it('should fail if the rule group does not exist', async () => {
     const groupToUpdate = group1;
     const ruleToUpdate = groupToUpdate.rules[0];
diff --git a/public/app/features/alerting/unified/hooks/ruleGroup/useUpsertRuleFromRuleGroup.ts b/public/app/features/alerting/unified/hooks/ruleGroup/useUpsertRuleFromRuleGroup.ts
index adc79753748..41a4664c54a 100644
--- a/public/app/features/alerting/unified/hooks/ruleGroup/useUpsertRuleFromRuleGroup.ts
+++ b/public/app/features/alerting/unified/hooks/ruleGroup/useUpsertRuleFromRuleGroup.ts
@@ -114,7 +114,7 @@ export function useMoveRuleToRuleGroup() {
 
       const result = await upsertRuleGroup({
         rulerConfig: targetGroupRulerConfig,
-        namespace: currentRuleGroup.namespaceName,
+        namespace: targetRuleGroup.namespaceName,
         payload: newTargetGroup,
         notificationOptions: { successMessage },
       }).unwrap();