diff --git a/src/services/services.ts b/src/services/services.ts
index 850e29030d801..5876da74f153e 100644
--- a/src/services/services.ts
+++ b/src/services/services.ts
@@ -3114,7 +3114,6 @@ namespace ts {
                 getCurrentDirectory: () => currentDirectory,
                 fileExists: (fileName): boolean => {
                     // stub missing host functionality
-                    Debug.assert(!host.resolveModuleNames || !host.resolveTypeReferenceDirectives);
                     return hostCache.getOrCreateEntry(fileName) !== undefined;
                 },
                 readFile: (fileName): string => {