diff --git a/src/server/editorServices.ts b/src/server/editorServices.ts
index 71d1188046..45d67f4333 100644
--- a/src/server/editorServices.ts
+++ b/src/server/editorServices.ts
@@ -389,7 +389,7 @@ namespace ts.server {
         }
 
         getTypeRootsVersion(project: ConfiguredProject) {
-            return getLatestDirectoryChangeTime(project.getEffectiveTypeRoots(), this.host);
+            return server.getLatestDirectoryChangeTime(project.getEffectiveTypeRoots(), this.host);
         }
 
         private handleChangeInSourceFileForConfiguredProject(project: ConfiguredProject) {
diff --git a/src/server/lsHost.ts b/src/server/lsHost.ts
index 0ae358591d..bfd3fc0be2 100644
--- a/src/server/lsHost.ts
+++ b/src/server/lsHost.ts
@@ -147,7 +147,7 @@ namespace ts.server {
 
         getTypeRootsVersion() {
             const roots = ts.getEffectiveTypeRoots(this.project.getCompilerOptions(), this);
-            return getLatestChangeTime(roots, this.host);
+            return server.getLatestDirectoryChangeTime(roots, this.host);
         }
 
         getScriptKind(fileName: string) {
diff --git a/src/server/utilities.ts b/src/server/utilities.ts
index cb7290711a..300aa6e0e6 100644
--- a/src/server/utilities.ts
+++ b/src/server/utilities.ts
@@ -94,7 +94,7 @@ namespace ts.server {
         if (!host.getModifiedTime || !host.directoryExists || !paths) {
             return 0;
         }
-        
+
         return Math.max.apply(Math, paths.map(path => {
             if (host.directoryExists(path)) {
                 return host.getModifiedTime(path);