diff --git a/src/harness/fourslashInterfaceImpl.ts b/src/harness/fourslashInterfaceImpl.ts
index 309dc84fb45..feb2520a593 100644
--- a/src/harness/fourslashInterfaceImpl.ts
+++ b/src/harness/fourslashInterfaceImpl.ts
@@ -1043,6 +1043,12 @@ export namespace Completion {
         kindModifiers: "declare",
         sortText: SortText.GlobalsOrKeywords,
     });
+    const deprecatedInterfaceEntry = (name: string): ExpectedCompletionEntryObject => ({
+        name,
+        kind: "interface",
+        kindModifiers: "deprecated,declare",
+        sortText: "z15" as SortText,
+    });
     const typeEntry = (name: string): ExpectedCompletionEntryObject => ({
         name,
         kind: "type",
@@ -1128,7 +1134,7 @@ export namespace Completion {
         interfaceEntry("TemplateStringsArray"),
         interfaceEntry("ImportMeta"),
         interfaceEntry("ImportCallOptions"),
-        interfaceEntry("ImportAssertions"),
+        deprecatedInterfaceEntry("ImportAssertions"),
         interfaceEntry("ImportAttributes"),
         varEntry("Math"),
         varEntry("Date"),
diff --git a/src/lib/es5.d.ts b/src/lib/es5.d.ts
index 1177ed2b513..6a7d6c6da09 100644
--- a/src/lib/es5.d.ts
+++ b/src/lib/es5.d.ts
@@ -626,6 +626,7 @@ interface ImportCallOptions {
 
 /**
  * The type for the `assert` property of the optional second argument to `import()`.
+ * @deprecated
  */
 interface ImportAssertions {
     [key: string]: string;
diff --git a/tests/baselines/reference/tsserver/fourslashServer/autoImportProvider_namespaceSameNameAsIntrinsic.js b/tests/baselines/reference/tsserver/fourslashServer/autoImportProvider_namespaceSameNameAsIntrinsic.js
index 5cfac18b024..083d72296c8 100644
--- a/tests/baselines/reference/tsserver/fourslashServer/autoImportProvider_namespaceSameNameAsIntrinsic.js
+++ b/tests/baselines/reference/tsserver/fourslashServer/autoImportProvider_namespaceSameNameAsIntrinsic.js
@@ -584,12 +584,6 @@ Info seq  [hh:mm:ss:mss] response:
             "kindModifiers": "declare",
             "sortText": "15"
           },
-          {
-            "name": "ImportAssertions",
-            "kind": "interface",
-            "kindModifiers": "declare",
-            "sortText": "15"
-          },
           {
             "name": "ImportAttributes",
             "kind": "interface",
@@ -1161,6 +1155,12 @@ Info seq  [hh:mm:ss:mss] response:
               "fileName": "/node_modules/fp-ts/index.d.ts",
               "isPackageJsonImport": true
             }
+          },
+          {
+            "name": "ImportAssertions",
+            "kind": "interface",
+            "kindModifiers": "deprecated,declare",
+            "sortText": "z15"
           }
         ]
       }