diff --git a/src/server/editorServices.ts b/src/server/editorServices.ts
index 71f7933e29f..4ffdf5d6c5d 100644
--- a/src/server/editorServices.ts
+++ b/src/server/editorServices.ts
@@ -370,7 +370,7 @@ namespace ts.server {
         private readonly throttledOperations: ThrottledOperations;
 
         private readonly hostConfiguration: HostConfiguration;
-        private static safelist: SafeList = defaultTypeSafeList;
+        private safelist: SafeList = defaultTypeSafeList;
 
         private changedFiles: ScriptInfo[];
 
@@ -1620,7 +1620,7 @@ namespace ts.server {
         }
 
         resetSafeList(): void {
-            ProjectService.safelist = defaultTypeSafeList;
+            this.safelist = defaultTypeSafeList;
         }
 
         loadSafeList(fileName: string): void {
@@ -1630,7 +1630,7 @@ namespace ts.server {
                 raw[k].match = new RegExp(raw[k].match as {} as string, "i");
             }
             // raw is now fixed and ready
-            ProjectService.safelist = raw;
+            this.safelist = raw;
         }
 
         applySafeList(proj: protocol.ExternalProject): void {
@@ -1641,8 +1641,8 @@ namespace ts.server {
 
             const normalizedNames = rootFiles.map(f => normalizeSlashes(f.fileName));
 
-            for (const name of Object.keys(ProjectService.safelist)) {
-                const rule = ProjectService.safelist[name];
+            for (const name of Object.keys(this.safelist)) {
+                const rule = this.safelist[name];
                 for (const root of normalizedNames) {
                     if (rule.match.test(root)) {
                         this.logger.info(`Excluding files based on rule ${name}`);