diff --git a/src/server/project.ts b/src/server/project.ts
index d6fb86425de..cf4167040cc 100644
--- a/src/server/project.ts
+++ b/src/server/project.ts
@@ -1077,7 +1077,7 @@ export abstract class Project implements LanguageServiceHost, ModuleResolutionHo
     }
 
     protected removeLocalTypingsFromTypeAcquisition(newTypeAcquisition: TypeAcquisition): TypeAcquisition {
-        if (!newTypeAcquisition || !newTypeAcquisition.include) {
+        if (!newTypeAcquisition.enable || !newTypeAcquisition.include) {
             // Nothing to filter out, so just return as-is
             return newTypeAcquisition;
         }
@@ -1627,8 +1627,9 @@ export abstract class Project implements LanguageServiceHost, ModuleResolutionHo
     }
 
     protected removeExistingTypings(include: string[]): string[] {
+        if (!include.length) return include;
         const existing = getAutomaticTypeDirectiveNames(this.getCompilerOptions(), this.directoryStructureHost);
-        return include.filter(i => !existing.includes(i));
+        return filter(include, i => !existing.includes(i));
     }
 
     private updateGraphWorker() {