diff --git a/packages/language-service/src/reflector_host.ts b/packages/language-service/src/reflector_host.ts
index 5e60375e6e..13ba23a885 100644
--- a/packages/language-service/src/reflector_host.ts
+++ b/packages/language-service/src/reflector_host.ts
@@ -19,6 +19,8 @@ class ReflectorModuleModuleResolutionHost implements ts.ModuleResolutionHost, Me
   });
 
   readonly directoryExists?: (directoryName: string) => boolean;
+  // Resolve a symbolic link.
+  realpath?: (path: string) => string;
 
   constructor(
       private readonly tsLSHost: ts.LanguageServiceHost,
@@ -26,6 +28,9 @@ class ReflectorModuleModuleResolutionHost implements ts.ModuleResolutionHost, Me
     if (tsLSHost.directoryExists) {
       this.directoryExists = directoryName => tsLSHost.directoryExists !(directoryName);
     }
+    if (tsLSHost.realpath) {
+      this.realpath = path => tsLSHost.realpath !(path);
+    }
   }
 
   fileExists(fileName: string): boolean {