diff --git a/packages/eslint-plugin/src/rules/no-unnecessary-qualifier.ts b/packages/eslint-plugin/src/rules/no-unnecessary-qualifier.ts
index 56286b8510c..4650ff5905f 100644
--- a/packages/eslint-plugin/src/rules/no-unnecessary-qualifier.ts
+++ b/packages/eslint-plugin/src/rules/no-unnecessary-qualifier.ts
@@ -94,7 +94,6 @@ export default createRule({
         accessedSymbol.flags,
         sourceCode.getText(name),
       );
-
       return (
         fromScope === undefined || symbolsAreEqual(accessedSymbol, fromScope)
       );
@@ -160,7 +159,11 @@ export default createRule({
     }
 
     return {
-      TSModuleDeclaration: enterDeclaration,
+      'TSModuleDeclaration > TSModuleBlock'(
+        node: TSESTree.TSModuleBlock,
+      ): void {
+        enterDeclaration(node.parent as TSESTree.TSModuleDeclaration);
+      },
       TSEnumDeclaration: enterDeclaration,
       'ExportNamedDeclaration[declaration.type="TSModuleDeclaration"]':
         enterDeclaration,
diff --git a/packages/eslint-plugin/tests/rules/no-unnecessary-qualifier.test.ts b/packages/eslint-plugin/tests/rules/no-unnecessary-qualifier.test.ts
index e31a8a99ecd..5f118f55ff6 100644
--- a/packages/eslint-plugin/tests/rules/no-unnecessary-qualifier.test.ts
+++ b/packages/eslint-plugin/tests/rules/no-unnecessary-qualifier.test.ts
@@ -29,6 +29,12 @@ namespace Y {
 }
     `,
     `
+namespace A {}
+namespace A.B {
+  export type Z = 1;
+}
+    `,
+    `
 enum A {
   X,
   Y,
@@ -146,6 +152,30 @@ namespace A {
     },
     {
       code: `
+namespace A {
+  export namespace B.C {
+    export type D = number;
+    const x: A.B.C.D = 3;
+  }
+}
+      `,
+      errors: [
+        {
+          messageId,
+          type: AST_NODE_TYPES.TSQualifiedName,
+        },
+      ],
+      output: `
+namespace A {
+  export namespace B.C {
+    export type D = number;
+    const x: D = 3;
+  }
+}
+      `,
+    },
+    {
+      code: `
 namespace A {
   export namespace B {
     export const x = 3;