diff --git a/src/compiler/moduleNameResolver.ts b/src/compiler/moduleNameResolver.ts
index e0acf43eadf..4f893302693 100644
--- a/src/compiler/moduleNameResolver.ts
+++ b/src/compiler/moduleNameResolver.ts
@@ -782,7 +782,7 @@ namespace ts {
         if (traceEnabled) {
             trace(host, Diagnostics.Resolving_real_path_for_0_result_1, path, real);
         }
-        Debug.assert(host.fileExists(real), `${path} linked to non-existing file ${real}`); // tslint:disable-line
+        Debug.assert(host.fileExists(real), `${path} linked to nonexistent file ${real}`); // tslint:disable-line
         return real;
     }