diff --git a/src/server/editorServices.ts b/src/server/editorServices.ts
index 895ba0cbc39..9a74ff3e53f 100644
--- a/src/server/editorServices.ts
+++ b/src/server/editorServices.ts
@@ -1804,7 +1804,7 @@ namespace ts.server {
             const path = toNormalizedPath(uncheckedFileName);
             const info = this.getScriptInfoForNormalizedPath(path);
             if (info) return info;
-            const configProject = this.configuredProjects.get(this.toCanonicalFileName(uncheckedFileName));
+            const configProject = this.configuredProjects.get(this.toCanonicalFileName(path));
             return configProject && configProject.getCompilerOptions().configFile;
         }