diff --git a/src/server/editorServices.ts b/src/server/editorServices.ts
index 91d400ff263..64ec600783a 100644
--- a/src/server/editorServices.ts
+++ b/src/server/editorServices.ts
@@ -803,9 +803,6 @@ namespace ts.server {
             } else {
                 this.log("no config file");
             }
-            if (configFileName) {
-                configFileName = getAbsolutePath(configFileName, searchPath);
-            }
             if (configFileName && (!this.configProjectIsActive(configFileName))) {
                 var configResult = this.openConfigFile(configFileName, fileName);
                 if (!configResult.success) {
@@ -910,7 +907,8 @@ namespace ts.server {
             configFilename = ts.normalizePath(configFilename);
             // file references will be relative to dirPath (or absolute)
             var dirPath = ts.getDirectoryPath(configFilename);
-            var rawConfig: { config?: ProjectOptions; error?: Diagnostic; } = ts.readConfigFile(configFilename);
+            var contents = this.host.readFile(configFilename)
+            var rawConfig: { config?: ProjectOptions; error?: Diagnostic; } = ts.parseConfigFileText(configFilename, contents);
             if (rawConfig.error) {
                 return rawConfig.error;
             }
diff --git a/tests/cases/fourslash/server/projectInfo.ts b/tests/cases/fourslash/server/projectInfo01.ts
similarity index 100%
rename from tests/cases/fourslash/server/projectInfo.ts
rename to tests/cases/fourslash/server/projectInfo01.ts
diff --git a/tests/cases/fourslash/server/projectInfo02.ts b/tests/cases/fourslash/server/projectInfo02.ts
new file mode 100644
index 00000000000..f884062fc14
--- /dev/null
+++ b/tests/cases/fourslash/server/projectInfo02.ts
@@ -0,0 +1,15 @@
+/// <reference path="../fourslash.ts"/>
+
+// @Filename: a.ts
+////export var test = "test String"
+
+// @Filename: b.ts
+////export var test2 = "test String"
+
+// @Filename: tsconfig.json
+////{ "files": ["a.ts", "b.ts"] }
+
+debugger;
+
+goTo.file("a.ts")
+verify.ProjectInfo(["lib.d.ts", "a.ts", "b.ts"])