diff --git a/src/harness/fourslashImpl.ts b/src/harness/fourslashImpl.ts
index c0b7053f93b73..592fe8817541a 100644
--- a/src/harness/fourslashImpl.ts
+++ b/src/harness/fourslashImpl.ts
@@ -879,7 +879,13 @@ namespace FourSlash {
                     nameToEntries.set(entry.name, [entry]);
                 }
                 else {
-                    if (entries.some(e => e.source === entry.source && this.deepEqual(e.data, entry.data))) {
+                    if (entries.some(e =>
+                        e.source === entry.source &&
+                        e.data?.exportName === entry.data?.exportName &&
+                        e.data?.fileName === entry.data?.fileName &&
+                        e.data?.moduleSpecifier === entry.data?.moduleSpecifier &&
+                        e.data?.ambientModuleName === entry.data?.ambientModuleName
+                    )) {
                         this.raiseError(`Duplicate completions for ${entry.name}`);
                     }
                     entries.push(entry);
@@ -1280,16 +1286,6 @@ namespace FourSlash {
 
         }
 
-        private deepEqual(a: unknown, b: unknown) {
-            try {
-                this.assertObjectsEqual(a, b);
-                return true;
-            }
-            catch {
-                return false;
-            }
-        }
-
         public verifyDisplayPartsOfReferencedSymbol(expected: ts.SymbolDisplayPart[]) {
             const referencedSymbols = this.findReferencesAtCaret()!;
 
diff --git a/src/server/project.ts b/src/server/project.ts
index ef48ebf530bc2..e490851c0e6e5 100644
--- a/src/server/project.ts
+++ b/src/server/project.ts
@@ -1928,20 +1928,25 @@ namespace ts.server {
             }
         }
 
+        /*@internal*/
+        static readonly compilerOptionsOverrides: CompilerOptions = {
+            diagnostics: false,
+            skipLibCheck: true,
+            sourceMap: false,
+            types: ts.emptyArray,
+            lib: ts.emptyArray,
+            noLib: true,
+        };
+
         /*@internal*/
         static create(dependencySelection: PackageJsonAutoImportPreference, hostProject: Project, moduleResolutionHost: ModuleResolutionHost, documentRegistry: DocumentRegistry): AutoImportProviderProject | undefined {
             if (dependencySelection === PackageJsonAutoImportPreference.Off) {
                 return undefined;
             }
 
-            const compilerOptions: CompilerOptions = {
+            const compilerOptions = {
                 ...hostProject.getCompilerOptions(),
-                noLib: true,
-                diagnostics: false,
-                skipLibCheck: true,
-                types: ts.emptyArray,
-                lib: ts.emptyArray,
-                sourceMap: false,
+                ...this.compilerOptionsOverrides,
             };
 
             const rootNames = this.getRootFileNames(dependencySelection, hostProject, moduleResolutionHost, compilerOptions);
diff --git a/src/testRunner/unittests/tsserver/autoImportProvider.ts b/src/testRunner/unittests/tsserver/autoImportProvider.ts
index 36d17d59d06a2..9d1978849295b 100644
--- a/src/testRunner/unittests/tsserver/autoImportProvider.ts
+++ b/src/testRunner/unittests/tsserver/autoImportProvider.ts
@@ -302,6 +302,15 @@ namespace ts.projectSystem {
             assert.isDefined(projectService.configuredProjects.get("/packages/a/tsconfig.json")!.getPackageJsonAutoImportProvider());
             assert.isDefined(projectService.configuredProjects.get("/packages/a/tsconfig.json")!.getPackageJsonAutoImportProvider());
         });
+
+        it("Can use the same document registry bucket key as main program", () => {
+            for (const option of sourceFileAffectingCompilerOptions) {
+                assert(
+                    !hasProperty(server.AutoImportProviderProject.compilerOptionsOverrides, option.name),
+                    `'${option.name}' may cause AutoImportProviderProject not to share source files with main program`
+                );
+            }
+        });
     });
 
     function setup(files: File[]) {
diff --git a/tests/cases/fourslash/server/autoImportProvider6.ts b/tests/cases/fourslash/server/autoImportProvider6.ts
new file mode 100644
index 0000000000000..b06d1557e45cd
--- /dev/null
+++ b/tests/cases/fourslash/server/autoImportProvider6.ts
@@ -0,0 +1,36 @@
+/// <reference path="../fourslash.ts" />
+
+// @Filename: /tsconfig.json
+//// { "compilerOptions": { "module": "commonjs", "lib": ["es2019"] } }
+
+// @Filename: /package.json
+//// { "dependencies": { "antd": "*", "react": "*" } }
+
+// @Filename: /node_modules/@types/react/index.d.ts
+//// export declare function Component(): void;
+
+// @Filename: /node_modules/antd/index.d.ts
+//// import "react";
+
+// @Filename: /index.ts
+//// Component/**/
+
+// react/index.d.ts will be in both the auto import provider program
+// and the main program, and will result in duplicate completions
+// unless the two programs successfully share the same source file.
+// This tests the configuration of the AutoImportProviderProject.
+// See also the 'Can use the same document registry bucket key as main program'
+// unit test in autoImportProvider.ts.
+goTo.marker("");
+verify.completions({
+  marker: "",
+  includes: [{
+    name: "Component",
+    hasAction: true,
+    source: "/node_modules/@types/react/index",
+    sortText: completion.SortText.AutoImportSuggestions,
+  }],
+  preferences: {
+    includeCompletionsForModuleExports: true,
+  },
+});